Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2015	Apr. 15, 2015
Document and Entity Information
Amendment Flag	false
Entity Registrant Name	INTERPUBLIC GROUP OF COMPANIES, INC.
Entity Central Index Key	0000051644
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Common Stock, Shares Outstanding		412,937,333

Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$ 1,676.0	$ 1,637.5
OPERATING EXPENSES:
Salaries and related expenses	1,215.2	1,188.6
Office and general expenses	453.0	460.6
Total operating expenses	1,668.2	1,649.2
OPERATING INCOME (LOSS)	7.8	(11.7)
EXPENSES AND OTHER INCOME:
Interest expense	(20.9)	(20.2)
Interest income	7.2	6.2
Other income, net	0.3	1.7
Total (expenses) and other income	(13.4)	(12.3)
Loss before income taxes	(5.6)	(24.0)
Benefit of income taxes	(1.4)	(1.7)
Loss of consolidated companies	(4.2)	(22.3)
Equity in net loss of unconsolidated affiliates	0	(0.1)
NET LOSS	(4.2)	(22.4)
Net loss attributable to noncontrolling interests	2.4	1.5
Net loss available to IPG common stockholders - basic and diluted	$ (1.8)	$ (20.9)
Loss Per Share, Basic and Diluted	$ 0.00	$ (0.05)
Weighted Average Number of Shares Outstanding, Basic and Diluted	411.1	422.8
Dividends declared per common share	$ 0.120	$ 0.095

Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Statement of Comprehensive Income [Abstract]

NET LOSS

$ (4.2)

$ (22.4)

Foreign currency translation:

Foreign currency translation adjustments

(135.1)

(1.0)

Less: reclassification adjustments recognized in net loss

(0.5)

(0.9)

Foreign Currency Transaction and Translation Adjustment, Net of Tax

(135.6)

(1.9)

Available-for-sale securities:

Changes in fair value of available-for sale securities

0.2

0.1

Income tax effect

(0.3)

Net unrealized gains/losses on available-for-sale securities, net of tax

(0.1)

0.1

Derivative instruments:

Changes in fair value of derivative instruments

(0.6)

Less: recognition of previously unrealized losses included in net loss

0.5

0.4

Income tax effect

(0.2)

0.1

Net unrecognized gains/losses on derivative instruments, net of tax

0.3

(0.1)

Defined benefit pension and other postretirement plans:

Net actuarial gains (losses) for the period

4.4

(0.3)

Less: amortization of unrecognized losses, transition obligation and prior service cost included in net loss

3.0

^[1]

2.6

^[1]

Other

0.1

(0.1)

Income tax effect

(0.9)

(0.6)

Defined benefit pension and other postretirement plans adjustment, net of tax

6.6

1.6

Other comprehensive loss, net of tax

(128.8)

(0.3)

TOTAL COMPREHENSIVE LOSS

(133.0)

(22.7)

Less: comprehensive loss attributable to noncontrolling interests

(3.2)

(2.1)

COMPREHENSIVE LOSS ATTRIBUTABLE TO IPG

$ (129.8)

$ (20.6)

[1]	These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 9 for further information.

Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS:
Cash and cash equivalents	$ 734.3	$ 1,660.6
Marketable securities	6.9	6.6
Accounts receivable, net of allowance of $57.2 and $59.5, respectively	3,781.4	4,376.6
Expenditures billable to clients	1,497.8	1,424.2
Other current assets	367.1	342.2
Total current assets	6,387.5	7,810.2
Property and equipment, net of accumulated depreciation of $1,057.6 and $1,070.0, respectively	523.3	548.2
Deferred income taxes	193.0	192.9
Goodwill	3,595.0	3,669.2
Other non-current assets	501.4	526.7
TOTAL ASSETS	11,200.2	12,747.2
LIABILITIES:
Accounts payable	5,468.5	6,558.0
Accrued liabilities	618.7	796.0
Short-term borrowings	135.7	107.2
Current portion of long-term debt	2.0	2.1
Total current liabilities	6,224.9	7,463.3
Long-term debt	1,620.6	1,623.5
Deferred compensation	473.2	527.9
Other non-current liabilities	694.0	723.9
TOTAL LIABILITIES	9,012.7	10,338.6
Redeemable noncontrolling interests	242.8	257.4
STOCKHOLDERS' EQUITY:
Common stock	41.4	41.2
Additional paid-in capital	1,580.0	1,547.5
Retained earnings	1,126.2	1,183.3
Accumulated other comprehensive loss, net of tax	(764.7)	(636.7)
Stockholders Equity Subtotal Before Treasury Stock	1,982.9	2,135.3
Less: Treasury stock	(70.2)	(19.0)
Total IPG stockholders' equity	1,912.7	2,116.3
Noncontrolling interests	32.0	34.9
TOTAL STOCKHOLDERS' EQUITY	1,944.7	2,151.2
TOTAL LIABILITIES AND EQUITY	11,200.2	12,747.2
Parentheticals:
Allowance for Doubtful Accounts Receivable	57.2	59.5
Accumulated Depreciation, Property and Equipment	$ 1,057.6	$ 1,070.0

Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
NET LOSS	$ (4.2)	$ (22.4)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization of fixed assets and intangible assets	38.7	40.5
Provision for uncollectible receivables	2.7	3.8
Amortization of restricted stock and other non-cash compensation	16.8	15.1
Net amortization of bond discounts and deferred financing costs	1.4	1.0
Deferred income tax benefit	(31.8)	(22.9)
Other	10.9	4.0
Changes in assets and liabilities, net of acquisitions and dispositions, providing (using) cash:
Accounts receivable	460.5	557.6
Expenditures billable to clients	(111.1)	(154.0)
Other current assets	(31.0)	(47.7)
Accounts payable	(946.1)	(905.6)
Accrued liabilities	(173.3)	(173.3)
Other non-current assets and liabilities	(30.4)	(21.8)
Net cash used in operating activities	(796.9)	(725.7)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(20.2)	(26.6)
Acquisitions, net of cash acquired	0	(22.1)
Other investing activities	0.2	1.6
Net cash used in investing activities	(20.0)	(47.1)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repurchase of common stock	(51.2)	(44.9)
Common stock dividends	(49.3)	(40.2)
Acquisition-related payments	(2.4)	(3.3)
Distributions to noncontrolling interests	(1.2)	(5.7)
Net increase (decrease) in short term bank borrowings	34.3	(6.7)
Exercise of stock options	9.1	6.2
Excess tax benefit on share-based compensation	8.5	3.3
Other financing activities	1.1	0.6
Net cash used in financing activities	(51.1)	(90.7)
Effect of foreign exchange rate changes on cash and cash equivalents	(58.3)	(2.3)
Net decrease in cash and cash equivalents	(926.3)	(865.8)
Cash and cash equivalents at beginning of period	1,660.6	1,636.8
Cash and cash equivalents at end of period	$ 734.3	$ 771.0

Consolidated Statements of Stockholders' Equity (USD $) In Millions	Total USD ($)	Common Stock, Shares	Common Stock USD ($)	Additional Paid-In Capital USD ($)	Retained Earnings USD ($)	Accumulated Other Comprehensive Loss, Net of Tax USD ($)	Treasury Stock USD ($)	Total IPG Stockholders' Equity USD ($)	Noncontrolling Interests USD ($)
Balance at Dec. 31, 2013	$ 2,250.8		$ 53.0	$ 2,975.2	$ 864.5	$ (411.2)	$ (1,266.3)	$ 2,215.2	$ 35.6
Balance, Common Stock Shares at Dec. 31, 2013		532.3
Net loss	(22.4)				(20.9)
Income (Loss) Attributable to Parent								(20.9)
Net Income (Loss) Attributable to Noncontrolling Interest	(1.5)								(1.5)
Other comprehensive loss	(0.3)					0.3		0.3
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	(2.1)								(0.6)
Reclassifications related to redeemable noncontrolling interests	4.5								4.5
Distributions to noncontrolling interests	(5.7)								(5.7)
Change in redemption value of redeemable noncontrolling interests	1.9				1.9			1.9
Repurchase of common stock	(44.9)						(44.9)	(44.9)
Common stock dividends	(40.2)				(40.2)			(40.2)
Stock-based compensation, shares		3.1
Stock-based compensation, value	32.8		0.2	32.6				32.8
Exercise of stock options, shares		0.5
Exercise of stock options, value	6.3		0.1	6.2				6.3
Shares withheld for taxes, shares		(0.8)
Shares withheld for taxes, value	(14.6)		(0.1)	(14.5)				(14.6)
Excess tax benefit from stock-based compensation	3.3			3.3				3.3
Other	(0.2)			(0.1)	(0.3)			(0.4)	(0.2)
Balance at Mar. 31, 2014	2,171.3		53.2	3,002.7	805.0	(410.9)	(1,311.2)	2,138.8	32.5
Balance, Common Stock Shares at Mar. 31, 2014		535.1
Balance at Dec. 31, 2014	2,151.2		41.2	1,547.5	1,183.3	(636.7)	(19.0)	2,116.3	34.9
Balance, Common Stock Shares at Dec. 31, 2014		414.6
Net loss	(4.2)				(1.8)
Income (Loss) Attributable to Parent								(1.8)
Net Income (Loss) Attributable to Noncontrolling Interest	(2.4)								(2.4)
Other comprehensive loss	(128.8)					(128.0)		(128.0)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	(3.2)								(0.8)
Reclassifications related to redeemable noncontrolling interests	1.5								1.5
Distributions to noncontrolling interests	(1.2)								(1.2)
Change in redemption value of redeemable noncontrolling interests	(5.8)				(5.8)			(5.8)
Repurchase of common stock	(51.2)						(51.2)	(51.2)
Common stock dividends	(49.3)				(49.3)			(49.3)
Stock-based compensation, shares		2.2
Stock-based compensation, value	32.0		0.2	31.8				32.0
Exercise of stock options, shares		0.9
Exercise of stock options, value	9.2		0.1	9.1				9.2
Shares withheld for taxes, shares		(0.8)
Shares withheld for taxes, value	(17.1)		(0.1)	(17.0)				(17.1)
Excess tax benefit from stock-based compensation	8.5			8.5				8.5
Other	(0.1)			0.1	(0.2)			(0.1)
Balance at Mar. 31, 2015	$ 1,944.7		$ 41.4	$ 1,580.0	$ 1,126.2	$ (764.7)	$ (70.2)	$ 1,912.7	$ 32.0
Balance, Common Stock Shares at Mar. 31, 2015		416.9

Basis of Presentation (Notes)	3 Months Ended
Basis of Presentation (Notes)	Mar. 31, 2015
Basis of Presentation [Abstract]
Basis of Presentation	Basis of Presentation The unaudited Consolidated Financial Statements have been prepared by The Interpublic Group of Companies, Inc. and its subsidiaries (the “Company,” “IPG,” “we,” “us” or “our”) in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for reporting interim financial information on Form 10-Q. Accordingly, they do not include certain information and disclosures required for complete financial statements. The preparation of financial statements in conformity with U.S. GAAP requires us to make judgments, assumptions and estimates that affect the amounts reported and disclosed. Actual results could differ from these estimates and assumptions. The consolidated results for interim periods are not necessarily indicative of results for the full year and should be read in conjunction with our 2014 Annual Report on Form 10-K. In the opinion of management, these unaudited Consolidated Financial Statements include all adjustments, consisting only of normal and recurring adjustments necessary for a fair statement of the information for each period contained therein.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References+ Details

Debt and Credit Arrangements (Notes)

3 Months Ended

Mar. 31, 2015

Debt and Credit Arrangements [Abstract]

Debt and Credit Arrangements

Long-Term Debt

A summary of the carrying amounts and fair values of our long-term debt is listed below.



	Effective Interest Rate	March 31, 2015				December 31, 2014
	Effective Interest Rate	Book Value		Fair Value ¹		Book Value		Fair Value ¹
2.25% Senior Notes due 2017 (less unamortized discount of $0.4)	2.30%	$	299.6	$	303.6	$	299.6	$	301.2
4.00% Senior Notes due 2022 (less unamortized discount of $2.2)	4.13%	247.8		263.2		247.7		255.2
3.75% Senior Notes due 2023 (less unamortized discount of $1.2)	4.32%	498.8		512.1		498.8		499.8
4.20% Senior Notes due 2024 (less unamortized discount of $0.9)	4.24%	499.1		531.5		499.1		509.8
Other notes payable and capitalized leases		77.3		77.3		80.4		80.4
Total long-term debt		1,622.6				1,625.6
Less: current portion		2.0				2.1
Long-term debt, excluding current portion		$	1,620.6			$	1,623.5


1	See Note 11 for information on the fair value measurement of our long-term debt.

Credit Agreements

We maintain a committed corporate credit facility (the "Credit Agreement") and uncommitted lines of credit to increase our financial flexibility. The Credit Agreement is a revolving facility, expiring in December 2018, under which amounts borrowed by us or any of our subsidiaries designated under the Credit Agreement may be repaid and reborrowed, subject to an aggregate lending limit of $1,000.0 or the equivalent in other currencies. The Company has the ability to increase the commitments under the Credit Agreement from time to time by an additional amount of up to $250.0, provided the Company receives commitments for such increases and satisfies certain other conditions. The aggregate available amount of letters of credit outstanding may decrease or increase, subject to a sublimit on letters of credit of $200.0 or the equivalent in other currencies. Our obligations under the Credit Agreement are unsecured.

We were in compliance with all of our covenants in the Credit Agreement as of March 31, 2015.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References+ Details

Loss Per Share (Notes)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Loss Per Share

The following sets forth basic and diluted loss per common share available to IPG common stockholders.



	Three months ended March 31,
	2015			2014
Net loss available to IPG common stockholders - basic and diluted	$	(1.8	)	$	(20.9	)
Weighted-average number of common shares outstanding - basic and diluted	411.1			422.8
Loss per share available to IPG common stockholders - basic and diluted	$	0.00		$	(0.05	)

Basic and diluted shares outstanding and loss per share are equal for the three months ended March 31, 2015 and 2014 because our potentially dilutive securities are antidilutive as a result of the net loss available to IPG common stockholders in each period presented.

The following table presents the potential shares excluded from the diluted loss per share calculation because the effect of including these potential shares would be antidilutive.



	Three months ended March 31,
	2015	2014
Restricted stock, stock options and other equity awards	6.3	6.8

- Definition

The entire disclosure for earnings per share.

+ References+ Details

Supplementary Data (Notes)

3 Months Ended

Mar. 31, 2015

Supplementary Data [Abstract]

Accrued Liabilities

The following table presents the components of accrued liabilities.



	March 31, 2015		December 31, 2014
Salaries, benefits and related expenses	$	331.0	$	510.6
Office and related expenses	52.3		51.5
Acquisition obligations	105.6		88.1
Interest	16.9		18.3
Restructuring and other reorganization-related	4.5		5.5
Other	108.4		122.0
Total accrued liabilities	$	618.7	$	796.0

Other Income, Net

Results of operations for the three months ended March 31, 2015 and 2014, include certain items that are not directly associated with our revenue-producing operations.



	Three months ended March 31,
	2015			2014
(Losses) gains on sales of businesses and investments	$	(0.1	)	$	0.8
Vendor discounts and credit adjustments	0.0			1.5
Other income (expense), net	0.4			(0.6		)
Total other income, net	$	0.3		$	1.7

(Losses) Gains on Sales of Businesses and Investments – During the three months ended March 31, 2015 and 2014, the amounts recognized related primarily to the sales of businesses within our Integrated Agency Networks ("IAN") segment.

Vendor Discounts and Credit Adjustments – In connection with the liabilities related to vendor discounts and credits established as part of the restatement we presented in our 2004 Annual Report on Form 10-K, these adjustments reflect the reversal of certain of these liabilities primarily where the statute of limitations has lapsed, or as a result of differences resulting from settlements with clients or vendors.

Other Income (Expense), net – During the three months ended March 31, 2015, we recorded a gain on liquidation of an entity in the United Kingdom region within our Corporate and other segment. During the three months ended March 31, 2014, we recognized a loss related to the impairment of an investment in the Asia Pacific region within our IAN segment.

Share Repurchase Program

In February 2015, our Board of Directors (the "Board") authorized a new share repurchase program to repurchase from time to time up to $300.0, excluding fees, of our common stock, which was in addition to the remaining amount available to be repurchased from the $300.0 authorization made by the Board in February 2014.

We may effect such repurchases through open market purchases, trading plans established in accordance with SEC rules, derivative transactions or other means. We expect to continue to repurchase our common stock in future periods, although the timing and amount of the repurchases will depend on market conditions and other funding requirements.

The following table presents our share repurchase activity under our share repurchase programs for the three months ended March 31, 2015 and 2014.



	Three months ended March 31,
	2015		2014
Number of shares repurchased	2.5		2.6
Aggregate cost, including fees	$	51.2	$	44.9
Average price per share, including fees	$	20.84	$	17.17

As of March 31, 2015, $392.3 remains available for repurchase under the share repurchase programs. The share repurchase programs have no expiration date.

Income Taxes (Notes)	3 Months Ended
Income Taxes (Notes)	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended March 31, 2015, our effective income tax rate of 25.0% was positively impacted by the recognition of previously unrecognized tax benefits as a result of the settlement of the 2010 U.S. federal income tax audit. Our effective income tax rate was negatively impacted primarily by losses in certain foreign jurisdictions where we receive no tax benefit due to 100% valuation allowances. We have various tax years under examination by tax authorities in various countries, and in various states, such as New York, in which we have significant business operations. It is not yet known whether these examinations will, in the aggregate, result in our paying additional taxes. We believe our tax reserves are adequate in relation to the potential for additional assessments in each of the jurisdictions in which we are subject to taxation. We regularly assess the likelihood of additional tax assessments in those jurisdictions and, if necessary, adjust our reserves as additional information or events require. With respect to all tax years open to examination by U.S. federal, various state and local, and non-U.S. tax authorities, we currently anticipate that total unrecognized tax benefits will decrease by an amount between $25.0 and $35.0 in the next twelve months, a portion of which will affect our effective income tax rate, primarily as a result of the settlement of tax examinations and the lapsing of statutes of limitations. We are effectively settled with respect to U.S. federal income tax audits for 2010 and years prior to 2009. With limited exceptions, we are no longer subject to state and local income tax audits for years prior to 2004 or non-U.S. income tax audits for years prior to 2006.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References+ Details

Incentive Compensation Plans (Notes)

3 Months Ended

Mar. 31, 2015

Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]

Incentive Compensation Plans

We issue stock-based compensation and cash awards to our employees under a plan established by the Compensation and Leadership Talent Committee of the Board of Directors (the “Compensation Committee”) and approved by our shareholders.

We issued the following stock-based awards under the 2014 Performance Incentive Plan (the "2014 PIP") during the three months ended March 31, 2015.

During the three months ended March 31, 2015, the Compensation Committee granted performance cash awards and restricted cash awards under the 2014 PIP with a total target value of $32.0 and $0.4, respectively. Cash awards are expensed over the vesting period, which is typically three years.

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References+ Details

Restructuring and Other Reorganization-Related Costs (Notes)

3 Months Ended

Mar. 31, 2015

Restructuring and Other Reorganization-Related Costs [Abstract]

Restructuring and Related Activities Disclosure [Text Block]

Restructuring and Other Reorganization-Related Liabilities

2013 Restructuring Plan

In the fourth quarter of 2013, we implemented a cost savings initiative (the "2013 Plan") to better align our cost structure with our revenue, primarily in Continental Europe. During the three months ended March 31, 2015, we recorded $0.1 of net reversals for the 2013 Plan within the IAN segment related to changes in the estimate of lease termination costs, which was included in office and general expenses within our unaudited Consolidated Statements of Operations. All restructuring actions were substantially completed by the end of the first quarter of 2014, with remaining payments expected to be made through 2021.

A summary of the 2013 Plan restructuring liability activity is listed below.



	December 31, 2014		Net Restructuring Reversals			Cash Payments			Foreign Currency Translation Adjustments			March 31, 2015
Severance and termination costs	$	4.4	$	0.0		$	(0.9	)	$	(0.2	)	$	3.3
Lease termination costs	2.6		(0.1		)	(0.2		)	(0.1		)	2.2
Total	$	7.0	$	(0.1	)	$	(1.1	)	$	(0.3	)	$	5.5

Prior Restructuring Plans

There were no restructuring charges nor other reorganization-related charges incurred for the 2003 and 2001 restructuring plans (the "Prior Restructuring Plans") for the three months ended March 31, 2015. As of March 31, 2015, the remaining liability for the Prior Restructuring Plans was $0.9.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References+ Details

Accumulated Other Comprehensive Loss, Net of Tax (Notes)

3 Months Ended

Mar. 31, 2015

Accumulated Other Comprehensive Income [Abstract]

Comprehensive Income (Loss) Note [Text Block]

Accumulated Other Comprehensive Loss, Net of Tax

The following tables present the changes in accumulated other comprehensive loss, net of tax by component.



	Foreign Currency Translation Adjustments			Available-for-Sale Securities			Derivative Instruments			Defined Benefit Pension and Other Postretirement Plans			Total
Balance as of December 31, 2014	$	(436.3	)	$	0.8		$	(10.9	)	$	(190.3	)	$	(636.7	)
Other comprehensive (loss) income before reclassifications	(134.3		)	0.2			0.0			4.5			(129.6		)
Amount reclassified from accumulated other comprehensive loss, net of tax	(0.5		)	(0.3		)	0.3			2.1			1.6
Balance as of March 31, 2015	$	(571.1	)	$	0.7		$	(10.6	)	$	(183.7	)	$	(764.7	)



	Foreign Currency Translation Adjustments			Available-for-Sale Securities		Derivative Instruments			Defined Benefit Pension and Other Postretirement Plans			Total
Balance as of December 31, 2013	$	(243.7	)	$	0.4	$	(11.7	)	$	(156.2	)	$	(411.2	)
Other comprehensive (loss) income before reclassifications	(0.4		)	0.1		(0.6		)	(0.4		)	(1.3		)
Amount reclassified from accumulated other comprehensive loss, net of tax	(0.9		)	0.0		0.5			2.0			1.6
Balance as of March 31, 2014	$	(245.0	)	$	0.5	$	(11.8	)	$	(154.6	)	$	(410.9	)

Amounts reclassified from accumulated other comprehensive loss, net of tax for the three months ended March 31, 2015 and 2014 are as follows:



	Three months ended March 31,						Affected Line Item in the Consolidated Statements of Operations
	2015			2014
Foreign currency translation adjustments	$	(0.5	)	$	(0.9	)	Other income, net
Losses on derivative instruments	0.5			0.4			Interest expense
Amortization of defined benefit pension and postretirement plans items ¹	3.0			2.6
Tax effect	(1.4		)	(0.5		)	Benefit of income taxes
Total amount reclassified from accumulated other comprehensive loss, net of tax	$	1.6		$	1.6


1	These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 9 for further information.

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

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+ Details

Employee Benefits (Notes)

3 Months Ended

Mar. 31, 2015

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Employee Benefits

We have a defined benefit pension plan that covers certain U.S. employees (the “Domestic Pension Plan”). We also have numerous funded and unfunded plans outside the U.S. The Interpublic Limited Pension Plan in the U.K. is a defined benefit plan and is our most material foreign pension plan in terms of the benefit obligation and plan assets. Some of our domestic and foreign subsidiaries provide postretirement health benefits and life insurance to eligible employees and, in certain cases, their dependents. The domestic postretirement benefit plan is our most material postretirement benefit plan in terms of the benefit obligation. Certain immaterial foreign pension and postretirement benefit plans have been excluded from the table below.

The components of net periodic cost for the Domestic Pension Plan, the significant foreign pension plans and the domestic postretirement benefit plan are listed below.



	Domestic Pension Plan						Foreign Pension Plans						Domestic Postretirement Benefit Plan
Three months ended March 31,	2015			2014			2015			2014			2015		2014
Service cost	$	0.0		$	0.0		$	2.5		$	2.5		$	0.0	$	0.0
Interest cost	1.5			1.6			4.7			5.9			0.4		0.4
Expected return on plan assets	(1.9		)	(1.9		)	(5.1		)	(6.2		)	0.0		0.0
Amortization of:
Unrecognized actuarial losses	2.0			1.7			1.0			0.9			0.0		0.0
Net periodic cost	$	1.6		$	1.4		$	3.1		$	3.1		$	0.4	$	0.4

During the three months ended March 31, 2015, we contributed $0.6 and $5.9 of cash to our domestic and foreign pension plans, respectively. For the remainder of 2015, we expect to contribute approximately $3.0 and $17.0 of cash to our domestic and foreign pension plans, respectively.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References+ Details

Segment Information (Notes)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Segment Reporting Disclosure

Segment Information

As of March 31, 2015, we have two reportable segments: IAN and Constituency Management Group ("CMG"). IAN is comprised of McCann Worldgroup, Foote, Cone & Belding ("FCB"), Lowe and Partners, IPG Mediabrands, our digital specialist agencies and our domestic integrated agencies. CMG is comprised of a number of our specialist marketing services offerings. We also report results for the “Corporate and other” group. The profitability measure employed by our chief operating decision maker for allocating resources to operating divisions and assessing operating division performance is segment operating income (loss). Segment information is presented consistently with the basis described in our 2014 Annual Report on Form 10-K; however, segment operating income (loss) for the three months ended March 31, 2015 and 2014 now includes the impact of net restructuring and other reorganization-related reversals. See Note 7 for further information on net restructuring and other reorganization-related liabilities.

Summarized financial information concerning our reportable segments is shown in the following table.



	Three months ended March 31,
	2015			2014
Revenue:
IAN	$	1,349.9		$	1,315.7
CMG	326.1			321.8
Total	$	1,676.0		$	1,637.5

Segment operating income (loss):
IAN	$	31.6		$	11.5
CMG	19.7			17.5
Corporate and other	(43.5		)	(40.7		)
Total	7.8			(11.7		)

Interest expense	(20.9		)	(20.2		)
Interest income	7.2			6.2
Other income, net	0.3			1.7
Loss before income taxes	$	(5.6	)	$	(24.0	)

Depreciation and amortization of property and equipment and intangible assets:
IAN	$	29.4		$	31.5
CMG	4.6			4.2
Corporate and other	4.7			4.8
Total	$	38.7		$	40.5

Capital expenditures:
IAN	$	12.1		$	13.9
CMG	1.1			2.5
Corporate and other	7.0			10.2
Total	$	20.2		$	26.6

	March 31, 2015			December 31, 2014
Total assets:
IAN	$	10,179.3		$	11,111.2
CMG	1,231.0			1,316.5
Corporate and other	(210.1		)	319.5
Total	$	11,200.2		$	12,747.2

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

Fair Value Measurements (Notes)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

Authoritative guidance for fair value measurements establishes a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:



Level 1		Unadjusted quoted prices in active markets for identical assets or liabilities. An active market for the asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2		Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3		Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Financial Instruments that are Measured at Fair Value on a Recurring Basis

We primarily apply the market approach to determine the fair value of financial instruments that are measured at fair value on a recurring basis. There were no changes to our valuation techniques used to determine the fair value of financial instruments during the three months ended March 31, 2015. The following tables present information about our financial instruments measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014, and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value.



	March 31, 2015												Balance Sheet Classification
	Level 1			Level 2			Level 3			Total			Balance Sheet Classification
Assets
Cash equivalents	$	244.6		$	0.0		$	0.0		$	244.6		Cash and cash equivalents
Short-term marketable securities	6.9			0.0			0.0			6.9			Marketable securities
Long-term investments	0.5			0.0			0.0			0.5			Other non-current assets
Total	$	252.0		$	0.0		$	0.0		$	252.0

As a percentage of total assets	2.2		%	0.0		%	0.0		%	2.2		%

Liabilities
Mandatorily redeemable noncontrolling interests ¹	$	0.0		$	0.0		$	46.8		$	46.8

	December 31, 2014												Balance Sheet Classification
	Level 1			Level 2			Level 3			Total			Balance Sheet Classification
Assets
Cash equivalents	$	901.4		$	0.0		$	0.0		$	901.4		Cash and cash equivalents
Short-term marketable securities	6.6			0.0			0.0			6.6			Marketable securities
Long-term investments	0.5			0.0			0.0			0.5			Other non-current assets
Total	$	908.5		$	0.0		$	0.0		$	908.5

As a percentage of total assets	7.1		%	0.0		%	0.0		%	7.1		%

Liabilities
Mandatorily redeemable noncontrolling interests ¹	$	0.0		$	0.0		$	32.8		$	32.8

Relates to unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligation was based upon the amount payable as if the forward contracts were settled. The amount redeemable within the next twelve months is classified in accrued liabilities; any interests redeemable thereafter are classified in other non-current liabilities.

The following table presents additional information about financial instruments measured at fair value on a recurring basis and for which we utilized Level 3 inputs to determine fair value for the three months ended March 31, 2015 and 2014.



	Three months ended March 31,
Liabilities	2015			2014
Mandatorily redeemable noncontrolling interests - Balance at beginning of period	$	32.8		$	27.0
Level 3 additions	15.0			2.0
Level 3 reductions	(1.4		)	0.0
Realized losses/(gains) included in net income	0.4			(0.1		)
Mandatorily redeemable noncontrolling interests - Balance at end of period	$	46.8		$	28.9

Realized losses/(gains) included in net income for mandatorily redeemable noncontrolling interests are reported as a component of interest expense in the unaudited Consolidated Statements of Operations.

Financial Instruments that are not Measured at Fair Value on a Recurring Basis

The following table presents information about our financial instruments that are not measured at fair value on a recurring basis as of March 31, 2015, and December 31, 2014, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.



	March 31, 2015								December 31, 2014
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Total long-term debt	$	0.0	$	1,610.4	$	77.3	$	1,687.7	$	0.0	$	1,566.0	$	80.4	$	1,646.4

Our long-term debt is comprised of senior notes and other notes payable. The fair value of our senior notes traded over-the-counter is based on quoted prices for such securities, but for which fair value can also be derived from inputs that are readily observable. Therefore, these senior notes are classified as Level 2 within the fair value hierarchy. Our other notes payable are not actively traded, and their fair value is not solely derived from readily observable inputs. Thus, the fair value of our other notes payable is determined based on proprietary valuation methods and therefore are classified as Level 3 within the fair value hierarchy. See Note 2 for further information on our long-term debt.

Non-financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis

Certain non-financial assets and liabilities are measured at fair value on a recurring basis, primarily accrued restructuring charges.

Non-financial Assets and Liabilities that are Measured at Fair Value on a Nonrecurring Basis

Certain non-financial assets and liabilities are measured at fair value on a nonrecurring basis, primarily goodwill, intangible assets, and property and equipment. Accordingly, these assets are not measured and adjusted to fair value on an ongoing basis but are subject to periodic evaluations for potential impairment.

Commitments and Contingencies (Notes)	3 Months Ended
Commitments and Contingencies (Notes)	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Matters We are involved in various legal proceedings, and subject to investigations, inspections, audits, inquiries and similar actions by governmental authorities, arising in the normal course of business. The types of allegations that arise in connection with such legal proceedings may vary in nature, but can include claims related to contract, employment, tax and intellectual property matters. We evaluate all cases each reporting period and record liabilities for losses from legal proceedings when we determine that it is probable that the outcome in a legal proceeding will be unfavorable and the amount, or potential range, of loss can be reasonably estimated. In certain cases, we cannot reasonably estimate the potential loss because, for example, the litigation is in its early stages. While any outcome related to litigation or such governmental proceedings in which we are involved cannot be predicted with certainty, management believes that the outcome of these matters, individually and in the aggregate, will not have a material adverse effect on our financial condition, results of operations or cash flows. Guarantees As discussed in our 2014 Annual Report on Form 10-K, we have guaranteed certain obligations of our subsidiaries relating principally to operating leases and credit facilities of certain subsidiaries. The amount of parent company guarantees on lease obligations was $538.4 and $580.4 as of March 31, 2015, and December 31, 2014, respectively, and the amount of parent company guarantees primarily relating to credit facilities was $325.9 and $329.2 as of March 31, 2015, and December 31, 2014, respectively.

- Definition

The entire disclosure for commitments and contingencies.

+ References+ Details

Recent Accounting Standards (Notes)	3 Months Ended
Recent Accounting Standards (Notes)	Mar. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Standards	Recent Accounting Standards Debt Issuance Costs In April 2015, the Financial Accounting Standards Board (the "FASB") issued amended guidance which requires debt issuance costs to be presented as a direct deduction from the carrying value of the associated debt liability rather than as separate assets on the balance sheet. The recognition and measurement guidance for debt issuance costs are not affected by this amendment. This amended guidance will be effective for us beginning January 1, 2016. Early adoption is permitted, and the new guidance will be applied on a retrospective basis. We do not expect the adoption of this amended guidance to have a significant impact on our Consolidated Financial Statements. Consolidation In February 2015, the FASB issued amended guidance to the consolidation standard which updates the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The amendment modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities (“VIEs”) or voting interest entities and affects the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, among other provisions. This amended guidance will be effective for us beginning January 1, 2016. Early adoption is permitted. We are currently assessing the impact the adoption of the amended guidance will have on our Consolidated Financial Statements. Extraordinary and Unusual Items In January 2015, the FASB issued amended guidance which eliminates the concept of extraordinary items from generally accepted accounting principles. This amendment is effective beginning January 1, 2016, and may be applied retrospectively or prospectively. Early adoption is permitted. Prior to this amendment, an entity was required to separately classify and present an event or transaction that was determined to be both unusual in nature and infrequent in occurrence as an extraordinary item, net of tax, after income from continuing operations in the income statement. Upon adopting this amended guidance, a material event or transaction that an entity considers to be unusual or infrequent, or both, may still be presented separately but will now be presented on a pre-tax basis within income from continuing operations or disclosed in the notes to the financial statements. We have early adopted this guidance as of the current quarter ended March 31, 2015. The adoption of this amended guidance did not have an impact on our Consolidated Financial Statements. Going Concern In August 2014, the FASB issued amended guidance which defines management's responsibility to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern and to provide related disclosures. Currently, this evaluation has only been an auditor requirement. Specifically, the amendments (1) provide a definition of the term “substantial doubt,” (2) require an evaluation every reporting period, (3) provide principles for considering the mitigating effect of management’s plans, (4) require certain disclosures when substantial doubt is alleviated as a result of the consideration of management’s plans, (5) require an express statement and other disclosures when substantial doubt is not alleviated, and (6) require an assessment for a period of one year after the date that financial statements are issued. This amended guidance will be effective for us beginning January 1, 2016. We do not expect the adoption of this amended guidance to have a significant impact on our Consolidated Financial Statements. Share-Based Payments with Performance Targets In June 2014, the FASB issued amended guidance which requires that a performance target that affects vesting, and that could be achieved after the requisite service period, be treated as a performance condition. This amended guidance will be effective for us beginning January 1, 2016 and can be either applied prospectively or retrospectively. As such, the performance target should not be reflected in estimating the grant date fair value of the award. We are currently assessing the impact the adoption of the amended guidance will have on our Consolidated Financial Statements. Revenue Recognition In May 2014, the FASB issued amended guidance on revenue recognition which requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In April 2015, the FASB proposed a one-year deferral of the effective date to January 1, 2018, with early adoption to be permitted as of the original effective date of January 1, 2017. We are currently assessing the impact the adoption of the amended guidance will have on our Consolidated Financial Statements.

- Definition

Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

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Subsequent Event (Notes)	3 Months Ended
Subsequent Event (Notes)	Mar. 31, 2015
Subsequent Event [Abstract]
Subsequent Events [Text Block]	Subsequent Event Brazil Investigation In response to concerns raised by local management, in recent months the Company began an investigation into certain transactions in Brazil and took a number of remedial and disciplinary actions based on our findings. On April 10, 2015, in connection with an ongoing investigation by Brazilian authorities involving payments potentially connected to local government contracts, a federal judge in Brazil authorized the search of a local subsidiary agency's records, and a former general manager of that agency was detained by the police. We are cooperating with the authorities and continuing our investigation.

Debt and Credit Arrangements (Tables)

3 Months Ended

Mar. 31, 2015

Debt and Credit Arrangements [Abstract]

Summary of Carrying Amounts and Fair Values of Long-term Debt

A summary of the carrying amounts and fair values of our long-term debt is listed below.



	Effective Interest Rate	March 31, 2015				December 31, 2014
	Effective Interest Rate	Book Value		Fair Value ¹		Book Value		Fair Value ¹
2.25% Senior Notes due 2017 (less unamortized discount of $0.4)	2.30%	$	299.6	$	303.6	$	299.6	$	301.2
4.00% Senior Notes due 2022 (less unamortized discount of $2.2)	4.13%	247.8		263.2		247.7		255.2
3.75% Senior Notes due 2023 (less unamortized discount of $1.2)	4.32%	498.8		512.1		498.8		499.8
4.20% Senior Notes due 2024 (less unamortized discount of $0.9)	4.24%	499.1		531.5		499.1		509.8
Other notes payable and capitalized leases		77.3		77.3		80.4		80.4
Total long-term debt		1,622.6				1,625.6
Less: current portion		2.0				2.1
Long-term debt, excluding current portion		$	1,620.6			$	1,623.5


1	See Note 11 for information on the fair value measurement of our long-term debt.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(e),(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Paragraph 6

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-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Schedule of Loss Per Share, Basic and Diluted

The following sets forth basic and diluted loss per common share available to IPG common stockholders.



	Three months ended March 31,
	2015			2014
Net loss available to IPG common stockholders - basic and diluted	$	(1.8	)	$	(20.9	)
Weighted-average number of common shares outstanding - basic and diluted	411.1			422.8
Loss per share available to IPG common stockholders - basic and diluted	$	0.00		$	(0.05	)

Schedule of Antidilutive Securities Excluded from Computation of Loss Per Share

The following table presents the potential shares excluded from the diluted loss per share calculation because the effect of including these potential shares would be antidilutive.



	Three months ended March 31,
	2015	2014
Restricted stock, stock options and other equity awards	6.3	6.8

Supplementary Data (Tables)

3 Months Ended

Mar. 31, 2015

Supplementary Data (Tables) [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

The following table presents the components of accrued liabilities.



	March 31, 2015		December 31, 2014
Salaries, benefits and related expenses	$	331.0	$	510.6
Office and related expenses	52.3		51.5
Acquisition obligations	105.6		88.1
Interest	16.9		18.3
Restructuring and other reorganization-related	4.5		5.5
Other	108.4		122.0
Total accrued liabilities	$	618.7	$	796.0

Schedule of Other Nonoperating Income, by Component [Table Text Block]

Results of operations for the three months ended March 31, 2015 and 2014, include certain items that are not directly associated with our revenue-producing operations.



	Three months ended March 31,
	2015			2014
(Losses) gains on sales of businesses and investments	$	(0.1	)	$	0.8
Vendor discounts and credit adjustments	0.0			1.5
Other income (expense), net	0.4			(0.6		)
Total other income, net	$	0.3		$	1.7

Share Repurchase Program [Table Text Block]

The following table presents our share repurchase activity under our share repurchase programs for the three months ended March 31, 2015 and 2014.



	Three months ended March 31,
	2015		2014
Number of shares repurchased	2.5		2.6
Aggregate cost, including fees	$	51.2	$	44.9
Average price per share, including fees	$	20.84	$	17.17

As of March 31, 2015, $392.3 remains available for repurchase under the share repurchase programs. The share repurchase programs have no expiration date.

Changes in redeemable noncontrolling interests [Table Text Block]

The following table presents changes in our redeemable noncontrolling interests.



	Three months ended March 31,
	2015			2014
Balance at beginning of period	$	257.4		$	249.1
Change in related noncontrolling interests balance	(2.1		)	(4.5		)
Changes in redemption value of redeemable noncontrolling interests:
Additions	0.0			7.9
Redemptions and other	(15.7		)	(1.9		)
Redemption value adjustments¹	3.2			(0.8		)
Balance at end of period	$	242.8		$	249.8


1	Redeemable noncontrolling interests are reported at their estimated redemption value in each reporting period but not less than their initial fair value. Any adjustment to the redemption value impacts retained earnings or additional paid-in capital, except adjustments as a result of currency translation.

Incentive Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2015

Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]

Stock-based Compensation Awards

We issued the following stock-based awards under the 2014 Performance Incentive Plan (the "2014 PIP") during the three months ended March 31, 2015.

Restructuring and Other Reorganization-Related Costs (Tables)

3 Months Ended

Mar. 31, 2015

Restructuring and Other Reorganization-Related Costs [Abstract]

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

A summary of the 2013 Plan restructuring liability activity is listed below.



	December 31, 2014		Net Restructuring Reversals			Cash Payments			Foreign Currency Translation Adjustments			March 31, 2015
Severance and termination costs	$	4.4	$	0.0		$	(0.9	)	$	(0.2	)	$	3.3
Lease termination costs	2.6		(0.1		)	(0.2		)	(0.1		)	2.2
Total	$	7.0	$	(0.1	)	$	(1.1	)	$	(0.3	)	$	5.5

Accumulated Other Comprehensive Loss, Net of Tax (Tables)

3 Months Ended

Mar. 31, 2015

Reclassification of Accumulated Other Comprehensive Income [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following tables present the changes in accumulated other comprehensive loss, net of tax by component.



	Foreign Currency Translation Adjustments			Available-for-Sale Securities			Derivative Instruments			Defined Benefit Pension and Other Postretirement Plans			Total
Balance as of December 31, 2014	$	(436.3	)	$	0.8		$	(10.9	)	$	(190.3	)	$	(636.7	)
Other comprehensive (loss) income before reclassifications	(134.3		)	0.2			0.0			4.5			(129.6		)
Amount reclassified from accumulated other comprehensive loss, net of tax	(0.5		)	(0.3		)	0.3			2.1			1.6
Balance as of March 31, 2015	$	(571.1	)	$	0.7		$	(10.6	)	$	(183.7	)	$	(764.7	)



	Foreign Currency Translation Adjustments			Available-for-Sale Securities		Derivative Instruments			Defined Benefit Pension and Other Postretirement Plans			Total
Balance as of December 31, 2013	$	(243.7	)	$	0.4	$	(11.7	)	$	(156.2	)	$	(411.2	)
Other comprehensive (loss) income before reclassifications	(0.4		)	0.1		(0.6		)	(0.4		)	(1.3		)
Amount reclassified from accumulated other comprehensive loss, net of tax	(0.9		)	0.0		0.5			2.0			1.6
Balance as of March 31, 2014	$	(245.0	)	$	0.5	$	(11.8	)	$	(154.6	)	$	(410.9	)

Disclosure of Reclassification Amount

Amounts reclassified from accumulated other comprehensive loss, net of tax for the three months ended March 31, 2015 and 2014 are as follows:



	Three months ended March 31,						Affected Line Item in the Consolidated Statements of Operations
	2015			2014
Foreign currency translation adjustments	$	(0.5	)	$	(0.9	)	Other income, net
Losses on derivative instruments	0.5			0.4			Interest expense
Amortization of defined benefit pension and postretirement plans items ¹	3.0			2.6
Tax effect	(1.4		)	(0.5		)	Benefit of income taxes
Total amount reclassified from accumulated other comprehensive loss, net of tax	$	1.6		$	1.6


1	These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 9 for further information.

- Definition

The entire disclosure for any adjustments made during the period to avoid double counting in comprehensive income items displayed as part of net income that also had been displayed as part of other comprehensive income in that period or earlier periods. These adjustments include reclassifications to net income of items in accumulated comprehensive income, such as deferred gains or losses on qualifying hedges when hedged item reported in net income, holding gains or losses on available-for-sale securities transferred into trading category, unrealized holding gains or losses on debt securities transferred from held-to-maturity category into available-for-sale category and accumulated translation adjustment attributable to foreign subsidiary or investment in foreign entity upon sale or liquidation.

+ References+ Details

Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2015

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Net Periodic Costs

The components of net periodic cost for the Domestic Pension Plan, the significant foreign pension plans and the domestic postretirement benefit plan are listed below.



	Domestic Pension Plan						Foreign Pension Plans						Domestic Postretirement Benefit Plan
Three months ended March 31,	2015			2014			2015			2014			2015		2014
Service cost	$	0.0		$	0.0		$	2.5		$	2.5		$	0.0	$	0.0
Interest cost	1.5			1.6			4.7			5.9			0.4		0.4
Expected return on plan assets	(1.9		)	(1.9		)	(5.1		)	(6.2		)	0.0		0.0
Amortization of:
Unrecognized actuarial losses	2.0			1.7			1.0			0.9			0.0		0.0
Net periodic cost	$	1.6		$	1.4		$	3.1		$	3.1		$	0.4	$	0.4

Segment Information (Tables)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Summarized financial information concerning our reportable segments is shown in the following table.



	Three months ended March 31,
	2015			2014
Revenue:
IAN	$	1,349.9		$	1,315.7
CMG	326.1			321.8
Total	$	1,676.0		$	1,637.5

Segment operating income (loss):
IAN	$	31.6		$	11.5
CMG	19.7			17.5
Corporate and other	(43.5		)	(40.7		)
Total	7.8			(11.7		)

Interest expense	(20.9		)	(20.2		)
Interest income	7.2			6.2
Other income, net	0.3			1.7
Loss before income taxes	$	(5.6	)	$	(24.0	)

Depreciation and amortization of property and equipment and intangible assets:
IAN	$	29.4		$	31.5
CMG	4.6			4.2
Corporate and other	4.7			4.8
Total	$	38.7		$	40.5

Capital expenditures:
IAN	$	12.1		$	13.9
CMG	1.1			2.5
Corporate and other	7.0			10.2
Total	$	20.2		$	26.6

	March 31, 2015			December 31, 2014
Total assets:
IAN	$	10,179.3		$	11,111.2
CMG	1,231.0			1,316.5
Corporate and other	(210.1		)	319.5
Total	$	11,200.2		$	12,747.2

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References+ Details

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value, Assets and Liabilities Measured on Recurring Basis

The following tables present information about our financial instruments measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014, and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value.



	March 31, 2015												Balance Sheet Classification
	Level 1			Level 2			Level 3			Total			Balance Sheet Classification
Assets
Cash equivalents	$	244.6		$	0.0		$	0.0		$	244.6		Cash and cash equivalents
Short-term marketable securities	6.9			0.0			0.0			6.9			Marketable securities
Long-term investments	0.5			0.0			0.0			0.5			Other non-current assets
Total	$	252.0		$	0.0		$	0.0		$	252.0

As a percentage of total assets	2.2		%	0.0		%	0.0		%	2.2		%

Liabilities
Mandatorily redeemable noncontrolling interests ¹	$	0.0		$	0.0		$	46.8		$	46.8

	December 31, 2014												Balance Sheet Classification
	Level 1			Level 2			Level 3			Total			Balance Sheet Classification
Assets
Cash equivalents	$	901.4		$	0.0		$	0.0		$	901.4		Cash and cash equivalents
Short-term marketable securities	6.6			0.0			0.0			6.6			Marketable securities
Long-term investments	0.5			0.0			0.0			0.5			Other non-current assets
Total	$	908.5		$	0.0		$	0.0		$	908.5

As a percentage of total assets	7.1		%	0.0		%	0.0		%	7.1		%

Liabilities
Mandatorily redeemable noncontrolling interests ¹	$	0.0		$	0.0		$	32.8		$	32.8

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation



	Three months ended March 31,
Liabilities	2015			2014
Mandatorily redeemable noncontrolling interests - Balance at beginning of period	$	32.8		$	27.0
Level 3 additions	15.0			2.0
Level 3 reductions	(1.4		)	0.0
Realized losses/(gains) included in net income	0.4			(0.1		)
Mandatorily redeemable noncontrolling interests - Balance at end of period	$	46.8		$	28.9

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis



	March 31, 2015								December 31, 2014
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Total long-term debt	$	0.0	$	1,610.4	$	77.3	$	1,687.7	$	0.0	$	1,566.0	$	80.4	$	1,646.4

- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

+ References+ Details

Long-term Debt (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Dec. 31, 2014

Debt Instrument [Line Items]

Long-term Debt

$ 1,622.6

$ 1,625.6

Less: current portion

2.0

2.1

Long-term Debt, Excluding Current Maturities

1,620.6

1,623.5

2.25% Notes

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Effective Percentage

2.30%

Debt Instrument, Interest Rate, Stated Percentage

2.25%

Debt Instrument, Maturity Date

Nov. 15, 2017

Debt Instrument, Unamortized Discount

0.4

Long-term Debt, Gross

299.6

Long-term Debt, Fair Value

303.6

^[1]

301.2

^[1]

4.00% Notes

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Effective Percentage

4.13%

Debt Instrument, Interest Rate, Stated Percentage

4.00%

Debt Instrument, Maturity Date

Mar. 15, 2022

Debt Instrument, Unamortized Discount

2.2

Long-term Debt, Gross

247.8

247.7

Long-term Debt, Fair Value

263.2

^[1]

255.2

^[1]

3.75% Notes

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Effective Percentage

4.32%

Debt Instrument, Interest Rate, Stated Percentage

3.75%

Debt Instrument, Maturity Date

Feb. 15, 2023

Debt Instrument, Unamortized Discount

1.2

Long-term Debt, Gross

498.8

Long-term Debt, Fair Value

512.1

^[1]

499.8

^[1]

4.20% Notes

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Effective Percentage

4.24%

Debt Instrument, Interest Rate, Stated Percentage

4.20%

Debt Instrument, Maturity Date

Apr. 15, 2024

Debt Instrument, Unamortized Discount

0.9

Long-term Debt, Gross

499.1

Long-term Debt, Fair Value

531.5

^[1]

509.8

^[1]

Other notes payable and capitalized leases

Debt Instrument [Line Items]

Long-term Debt, Gross

77.3

80.4

Long-term Debt, Fair Value

$ 77.3

^[1]

$ 80.4

^[1]

[1]	See Note 11 for information on the fair value measurement of our long-term debt.

Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Debt and Credit Arrangements [Abstract]
Line of Credit Facility, Expiration Date	Dec. 12, 2018
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000.0
Line of Credit Facility, Increase (Decrease), Net	250.0
Line of Credit Facility, Amount Outstanding	$ 200.0
Line of Credit Facility, Covenant Compliance	3/31/2015

Loss Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Loss Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss available to IPG common stockholders - basic and diluted	$ (1.8)	$ (20.9)
Weighted Average Number of Shares Outstanding, Basic and Diluted	411.1	422.8
Loss Per Share, Basic and Diluted	$ 0.00	$ (0.05)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References+ Details

Antidilutive Shares (Details) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities [Abstract]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6.3	6.8

Supplementary Data Accrued Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accrued Liabilities [Abstract]
Salaries, benefits and related expenses	$ 331.0	$ 510.6
Office and related expenses	52.3	51.5
Acquisition obligations	105.6	88.1
Interest	16.9	18.3
Restructuring and other reorganization-related	4.5	5.5
Other Accrued Liabilities, Current	108.4	122.0
Accrued Liabilities, Current	$ 618.7	$ 796.0

- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details

Supplementary Data Other Income, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Other Income, net (details) [Abstract]
(Losses) gains on sales of businesses and investments	$ (0.1)	$ 0.8
Vendor discounts and credit adjustments	0	1.5
Other income (expense), net	0.4	(0.6)
Other income, net	$ 0.3	$ 1.7

Supplementary Data Share Repurchase Program (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 392.3
Number of shares repurchased	2.5	2.6
Aggregate cost, including fees	51.2	44.9
Average price per share, including fees	$ 20.84	$ 17.17
2015 Share Repurchase Program
Stock Repurchase Program, Authorized Amount	300.0
2014 Share Repurchase Program
Stock Repurchase Program, Authorized Amount		$ 300.0

Supplementary Data Changes in Redemable Noncontrolling Interest (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Changes in Redeemable Noncontrolling Interest [Abstract]

Balance at beginning of period

$ 257.4

$ 249.1

(2.1)

(4.5)

Redeemable noncontrolling interests period increase

7.9

Changes in redemption value of redeemable noncontrolling interests [Abstract]

Redemptions and other

(15.7)

(1.9)

Redemption value adjustments

3.2

^[1]

(0.8)

^[1]

Balance at end of period

$ 242.8

$ 249.8

[1]

1Redeemable noncontrolling interests are reported at their estimated redemption value in each reporting period but not less than their initial fair value. Any adjustment to the redemption value impacts retained earnings or additional paid-in capital, except adjustments as a result of currency translation.

- Definition

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References+ Details

Income Taxes Effective Income Tax Rate (Details)	3 Months Ended
Income Taxes Effective Income Tax Rate (Details)	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate	25.00%
One hundred percent valuation allowance	100.00%

Income Taxes Change in Unrecognized Tax Benefits (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Estimated unrecognized tax benefit decrease, lower bound	$ 25.0
Estimated unrecognized tax benefit decrease, upper bound	$ 35.0

Tax Years Open to Examinations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Income Tax Contingency
Significant (Increase) Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	$ 35.0
Maximum [Member] \| Domestic Tax Authority
Income Tax Contingency
Open Tax Year	2010
Minimum \| Domestic Tax Authority
Income Tax Contingency
Open Tax Year	2009
Minimum \| State and Local Jurisdiction
Income Tax Contingency
Open Tax Year	2004
Minimum \| Foreign Tax Authority
Income Tax Contingency
Open Tax Year	2006

Incentive Compensation Plans Plan Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Incentive Compensation Plan Initiation Year	2014
Performance Cash awards granted during the period target value	$ 0.4
Restricted Cash Plan cash awards granted during the period target value	$ 32.0
Cash awards vesting period	3 years

Incentive Compensation Plans Stock-based Compensation Awards (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Stock settled awards
Incentive Compensation Plans
Granted awards	0.6
Weighted Average Grant Date Fair Value	$ 22.39
Performance based awards
Incentive Compensation Plans
Granted awards	2.8
Weighted Average Grant Date Fair Value	$ 20.93
Stock Compensation Plan
Incentive Compensation Plans
Granted awards	3.4

Restructuring and Other Reorganization-Related Costs 2013 Plan (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Restructuring Cost and Reserve
Line of Credit Facility, Covenant Compliance	3/31/2015
2013 Restructuring Plan
Restructuring Cost and Reserve
Beginning liability balance	$ 7.0
Net Restructuring Reversals	(0.1)
Cash payments	(1.1)
Restructuring Reserve, Translation and Other Adjustment	(0.3)
Ending liability balance	5.5
Severance and termination costs \| 2013 Restructuring Plan
Restructuring Cost and Reserve
Beginning liability balance	4.4
Net Restructuring Reversals	0
Cash payments	(0.9)
Restructuring Reserve, Translation and Other Adjustment	(0.2)
Ending liability balance	3.3
Lease termination costs \| 2013 Restructuring Plan
Restructuring Cost and Reserve
Beginning liability balance	2.6
Net Restructuring Reversals	(0.1)
Cash payments	(0.2)
Restructuring Reserve, Translation and Other Adjustment	(0.1)
Ending liability balance	$ 2.2

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details

Accumulated Other Comprehensive Loss, Net of Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Foreign Currency Translation Adjustment:
Balance at beginning of period	$ (436.3)	$ (243.7)
Other comprehensive (loss) income before reclassifications	(134.3)	(0.4)
Amount reclassified from accumulated other comprehensive loss, net of tax	(0.5)	(0.9)
Balance at end of period	(571.1)	(245.0)
Available-for-sale Securities:
Balance at beginning of period	0.8	0.4
Other comprehensive (loss) income before reclassifications	0.2	0.1
Amount reclassified from accumulated other comprehensive loss, net of tax	(0.3)	0
Balance at end of period	0.7	0.5
Derivative instruments:
Balance at beginning of period	(10.9)	(11.7)
Other comprehensive (loss) income before reclassifications	0	(0.6)
Amount reclassified from accumulated other comprehensive loss, net of tax	0.3	0.5
Balance at end of period	(10.6)	(11.8)
Defined benefit pension and other postretirement plans:
Balance at beginning of period	(190.3)	(156.2)
Other comprehensive (loss) income before reclassifications	4.5	(0.4)
Amount reclassified from accumulated other comprehensive loss,net of tax	2.1	2.0
Balance at end of period	(183.7)	(154.6)
Total Changes in Accumulated Other Comprehensive Loss, Net of Tax [Abstract]
Balance at beginning of period	(636.7)	(411.2)
Other comprehensive (loss) income before reclassifications	(129.6)	(1.3)
Amount reclassified from accumulated other comprehensive loss, net of tax	1.6	1.6
Balance at end of period	$ (764.7)	$ (410.9)

Accumulated Other Comprehensive Loss, Net of Tax Reclassification of Accumulated Other Comprehensive Loss (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Reclassification of Accumulated Other Comprehensive Income [Abstract]

Foreign currency translation adjustments

$ (0.5)

$ (0.9)

Losses on derivative instruments

0.5

0.4

Amortization of defined benefit pension and postretirement plans items

3.0

^[1]

2.6

^[1]

Tax effect

(1.4)

(0.5)

Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax

$ (1.6)

[1]	These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 9 for further information.

- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

+ References+ Details

Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Domestic Pension Plan
Defined Pension and Postretirement Benefit Plans
Service cost	$ 0	$ 0
Interest cost	1.5	1.6
Expected return on plan assets	(1.9)	(1.9)
Amortization of:
Unrecognized actuarial losses	2.0	1.7
Net periodic cost	1.6	1.4
Pension Plan - Employer Contributions	0.6
Pension Plan - Estimated Employer Contributions Current fiscal year	3.0
Foreign Pension Plans
Defined Pension and Postretirement Benefit Plans
Service cost	2.5	2.5
Interest cost	4.7	5.9
Expected return on plan assets	(5.1)	(6.2)
Amortization of:
Unrecognized actuarial losses	1.0	0.9
Net periodic cost	3.1	3.1
Pension Plan - Employer Contributions	5.9
Pension Plan - Estimated Employer Contributions Current fiscal year	17.0
Domestic Postretirement Benefit Plan
Defined Pension and Postretirement Benefit Plans
Service cost	0	0
Interest cost	0.4	0.4
Expected return on plan assets	0	0
Amortization of:
Unrecognized actuarial losses	0	0
Net periodic cost	$ 0.4	$ 0.4

Segment Information Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segments:
Revenue	$ 1,676.0	$ 1,637.5
Operating Income (Loss)	7.8	(11.7)
Interest expense	20.9	20.2
Interest income	7.2	6.2
Other income, net	0.3	1.7
Loss before income taxes	(5.6)	(24.0)
Depreciation and amortization of fixed assets and intangible assets	38.7	40.5
Capital expenditures	20.2	26.6
IAN
Segments:
Revenue	1,349.9	1,315.7
Operating Income (Loss)	31.6	11.5
Depreciation and amortization of fixed assets and intangible assets	29.4	31.5
Capital expenditures	12.1	13.9
CMG
Segments:
Revenue	326.1	321.8
Operating Income (Loss)	19.7	17.5
Depreciation and amortization of fixed assets and intangible assets	4.6	4.2
Capital expenditures	1.1	2.5
Corporate and Other
Segments:
Operating Income (Loss)	(43.5)	(40.7)
Depreciation and amortization of fixed assets and intangible assets	4.7	4.8
Capital expenditures	$ 7.0	$ 10.2

Segment Information Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Segments:
Assets	$ 11,200.2	$ 12,747.2
IAN
Segments:
Assets	10,179.3	11,111.2
CMG
Segments:
Assets	1,231.0	1,316.5
Corporate and Other
Segments:
Assets	$ (210.1)	$ 319.5

Fair Value on a Recurring Basis (Details) (USD $)
In Millions, unless otherwise specified

Mar. 31, 2015

Dec. 31, 2014

Level 1

Fair value assets and liabilities measured on recurring and nonrecurring basis

Cash equivalents

$ 244.6

$ 901.4

Short-term marketable securities

6.9

6.6

Long-term investments

0.5

Fair Value of Total Assets, Recurring

252.0

908.5

Fair value of assets measured on a recurring basis, percentage of total assets

2.20%

7.10%

Mandatorily redeemable noncontrolling interests

^[1]

Level 2

Fair value assets and liabilities measured on recurring and nonrecurring basis

Cash equivalents

Short-term marketable securities

Long-term investments

Fair Value of Total Assets, Recurring

Fair value of assets measured on a recurring basis, percentage of total assets

0.00%

Mandatorily redeemable noncontrolling interests

^[1]

Level 3

Fair value assets and liabilities measured on recurring and nonrecurring basis

Cash equivalents

Short-term marketable securities

Long-term investments

Fair Value of Total Assets, Recurring

Fair value of assets measured on a recurring basis, percentage of total assets

0.00%

Mandatorily redeemable noncontrolling interests

46.8

^[1]

32.8

^[1]

Fair Value, Total

Fair value assets and liabilities measured on recurring and nonrecurring basis

Cash equivalents

244.6

901.4

Short-term marketable securities

6.9

6.6

Long-term investments

0.5

Fair Value of Total Assets, Recurring

252.0

908.5

Fair value of assets measured on a recurring basis, percentage of total assets

2.20%

7.10%

Mandatorily redeemable noncontrolling interests

$ 46.8

^[1]

$ 32.8

^[1]

[1]

Fair Value Unobservable Inputs (Details) (Mandatorily redeemable noncontrolling interests [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Mandatorily redeemable noncontrolling interests [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Balance at beginning of period	$ 32.8	$ 27.0
Level 3 additions	15.0	2.0
Level 3 reductions	(1.4)	0
Realized losses/(gains) included in net income	0.4	(0.1)
Balance at end of period	$ 46.8	$ 28.9

Fair Value Measurements Fair Value on a Nonrecurring Basis (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Level 1
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total long-term debt	$ 0	$ 0
Level 2
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total long-term debt	1,610.4	1,566.0
Level 3
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total long-term debt	77.3	80.4
Fair Value, Total
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total long-term debt	$ 1,687.7	$ 1,646.4

Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Lease guarantees	$ 538.4	$ 580.4
Credit facility guarantees	$ 325.9	$ 329.2

Restructuring and Other Reorganization-Related Costs Prior Year Plans (Details) (Prior Year Restructuring Plans [Domain], USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Prior Year Restructuring Plans [Domain]
Restructuring Reserve	$ 0.9

Weighted-average
grant-date fair value
(per award)

Stock-settled awards

Performance-based awards

Total stock-based compensation awards