The Interpublic Group of Companies, Inc. (IPG) 10-Q 27 Jul 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 14, 2017
Document and Entity Information
Amendment Flag	false
Entity Registrant Name	INTERPUBLIC GROUP OF COMPANIES, INC.
Entity Central Index Key	51,644
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Entity Common Stock, Shares Outstanding		393,268,676

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 1,884.9	$ 1,917.9	$ 3,638.8	$ 3,659.9
OPERATING EXPENSES:
Salaries and related expenses	1,239.3	1,229.5	2,514.7	2,498.3
Office and general expenses	439.1	464.1	887.9	914.3
Total operating expenses	1,678.4	1,693.6	3,402.6	3,412.6
OPERATING INCOME	206.5	224.3	236.2	247.3
EXPENSES AND OTHER INCOME:
Interest expense	(25.7)	(24.5)	(46.6)	(47.1)
Interest income	4.7	5.6	9.9	11.4
Other (expense) income, net	(15.4)	0.4	(14.6)	(18.8)
Total (expenses) and other income	(36.4)	(18.5)	(51.3)	(54.5)
Income before income taxes	170.1	205.8	184.9	192.8
Provision for income taxes	75.4	43.7	73.3	28.1
Income of consolidated companies	94.7	162.1	111.6	164.7
Equity in net (loss) income of unconsolidated affiliates	(0.1)	(1.9)	1.1	(1.8)
NET INCOME	94.6	160.2	112.7	162.9
Net loss (income) attributable to noncontrolling interests	0.1	(3.3)	3.5	(0.6)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS	$ 94.7	$ 156.9	$ 116.2	$ 162.3
Earnings per share, Basic	$ 0.24	$ 0.39	$ 0.30	$ 0.41
Earnings per share, Diluted	$ 0.24	$ 0.38	$ 0.29	$ 0.40
Weighted-average number of common shares outstanding, Basic	392.3	400.1	392	400.4
Weighted-average number of common shares outstanding, Diluted	400.3	409.8	399.6	409.4
Dividends declared per common share	$ 0.18	$ 0.15	$ 0.36	$ 0.30

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
NET INCOME		$ 94.6	$ 160.2	$ 112.7	$ 162.9
Foreign currency translation:
Foreign currency translation adjustments		32.6	(17.8)	84.8	39.1
Reclassification adjustments recognized in net income	[1]	0.7	7.5	0.3	6.5
Foreign currency transaction and translation adjustment, net of tax		33.3	(10.3)	85.1	45.6
Available-for-sale securities:
Changes in fair value of available-for sale securities		0	0.1	0.1	0.2
Recognition of previously unrealized gains in net income		0	(1.2)	0	(1.2)
Net unrealized gains/losses on available-for-sale securities, net of tax		0	(1.1)	0.1	(1)
Derivative instruments:
Recognition of previously unrealized losses in net income		0.6	0.5	1.1	1
Income tax effect		(0.2)	(0.2)	(0.4)	(0.4)
Net unrecognized gains/losses on derivative instruments, net of tax		0.4	0.3	0.7	0.6
Defined benefit pension and other postretirement plans:
Net actuarial gains for the period		0.8	0.6	0.8	0.8
Amortization of unrecognized losses, transition obligation and prior service cost included in net income		1.8	(0.2)	3.5	2.5
Settlement and curtailment losses included in net income		0	0.2	0	0.2
Other		(0.4)	(0.1)	(0.6)	0
Income tax effect		(0.5)	0.2	(0.6)	(0.5)
Defined benefit pension and other postretirement plans adjustment, net of tax		1.7	0.7	3.1	3
Other comprehensive income (loss), net of tax		35.4	(10.4)	89	48.2
TOTAL COMPREHENSIVE INCOME		130	149.8	201.7	211.1
Less: comprehensive income (loss) attributable to noncontrolling interests		0.1	2.7	(2.8)	0.5
COMPREHENSIVE INCOME ATTRIBUTABLE TO IPG		$ 129.9	$ 147.1	$ 204.5	$ 210.6
[1]	These foreign currency translation adjustments are primarily a result of the sales of businesses

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
ASSETS:
Cash and cash equivalents	$ 657.6	$ 1,097.6
Marketable securities	3.2	3
Accounts receivable, net of allowance of $56.8 and $55.7, respectively	3,762.2	4,389.7
Expenditures billable to clients	1,720.7	1,518.1
Assets held for sale	19.7	203.2
Other current assets	323.1	226.4
Total current assets	6,486.5	7,438
Property and equipment, net of accumulated depreciation of $1,020.7 and $961.6, respectively	635	622
Deferred income taxes	260.9	220.3
Goodwill	3,753.1	3,674.4
Other non-current assets	542.7	530.5
TOTAL ASSETS	11,678.2	12,485.2
LIABILITIES:
Accounts payable	5,872	6,303.6
Accrued liabilities	513.1	794
Short-term borrowings	237.7	85.7
Current portion of long-term debt	301.7	323.9
Liabilities held for sale	21.7	198.8
Total current liabilities	6,946.2	7,706
Long-term debt	1,283.1	1,280.7
Deferred compensation	461.8	480.7
Other non-current liabilities	731.4	708.3
TOTAL LIABILITIES	9,422.5	10,175.7
Redeemable noncontrolling interests (see Note 4)	243.4	252.8
STOCKHOLDERS' EQUITY:
Common stock	39.9	39.4
Additional paid-in capital	1,220.2	1,199.2
Retained earnings	1,774.9	1,804.3
Accumulated other comprehensive loss, net of tax	(874.2)	(962.5)
Stockholders Equity Subtotal Before Treasury Stock	2,160.8	2,080.4
Less: Treasury stock	(178.3)	(63.3)
Total IPG stockholders' equity	1,982.5	2,017.1
Noncontrolling interests	29.8	39.6
TOTAL STOCKHOLDERS' EQUITY	2,012.3	2,056.7
TOTAL LIABILITIES AND EQUITY	11,678.2	12,485.2
Parentheticals:
Allowance for Doubtful Accounts Receivable	56.8	55.7
Accumulated Depreciation, Property and Equipment	$ 1,020.7	$ 961.6

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 112.7	$ 162.9
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization of fixed assets and intangible assets	82.3	77.8
Provision for uncollectible receivables	8.6	7.6
Amortization of restricted stock and other non-cash compensation	46	39.9
Net amortization of bond discounts and deferred financing costs	2.8	2.8
Deferred income tax provision (benefit)	1.5	(4.2)
Net losses on sales of businesses	12.2	20
Other	10.2	28.7
Changes in assets and liabilities, net of acquisitions and dispositions, providing (using) cash:
Accounts receivable	769.7	428.2
Expenditures billable to clients	(165.3)	(110.8)
Other current assets	(82)	(33.3)
Accounts payable	(622.9)	(848.7)
Accrued liabilities	(313.9)	(251.8)
Other non-current assets and liabilities	(15)	(72.9)
Net cash used in operating activities	(153.1)	(553.8)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(68.9)	(63)
Acquisitions, net of cash acquired	(12.6)	(34.3)
Other investing activities	(14.5)	(4.9)
Net cash used in investing activities	(96)	(102.2)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common stock dividends	(141.4)	(120.1)
Repurchase of common stock	(115)	(112.5)
Tax payments for employee shares withheld	(37.8)	(22.7)
Acquisition-related payments	(36.3)	(29.2)
Repayment of long-term debt	(23.6)	(1)
Distributions to noncontrolling interests	(10.9)	(7.2)
Net increase in short-term borrowings	153.5	55
Exercise of stock options	11.8	9.8
Other financing activities	0.3	0.9
Net cash used in financing activities	(199.4)	(227)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	8.2	52.6
Net decrease in cash, cash equivalents and restricted cash	(440.3)	(830.4)
Cash, cash equivalents and restricted cash at beginning of period	1,100.2	1,506.1
Cash, cash equivalents and restricted cash at end of period	$ 659.9	$ 675.7

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock, Shares	Common Stock, Amount	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss, Net of Tax	Treasury Stock	Total IPG Stockholders' Equity	Noncontrolling Interests
Balance, common stock shares at Dec. 31, 2015		404.4
Balance at Dec. 31, 2015	$ 2,001.8		$ 40.4	$ 1,404.1	$ 1,437.6	$ (845.6)	$ (71)	$ 1,965.5	$ 36.3
NET INCOME	162.9
Net income available to IPG common stockholders	162.3				162.3			162.3
Net income attributable to noncontrolling interest	0.6								0.6
Other comprehensive income (loss)	48.2					48.3		48.3
Other comprehensive income (loss), attributable to noncontrolling interest									(0.1)
Reclassifications related to redeemable noncontrolling interests	2.5								2.5
Distributions to noncontrolling interests	(7.2)								(7.2)
Change in redemption value of redeemable noncontrolling interests	(3.9)				(3.9)			(3.9)
Repurchase of common stock	(112.5)						(112.5)	(112.5)
Common stock dividend	(120.1)				(120.1)			(120.1)
Stock-based compensation, shares		3.3
Stock-based compensation, value	67.7		0.3	67.4				67.7
Exercise of stock options, shares		1.1
Exercise of stock options, value	9.8		0.1	9.7				9.8
Shares withheld for taxes, shares		(1)
Shares withheld for taxes, value	(22.7)		(0.1)	(22.6)				(22.7)
Other	1.6			1.8	(0.6)			1.2	(0.4)
Balance, common stock shares at Jun. 30, 2016		407.8
Balance at Jun. 30, 2016	2,028.1		40.7	1,460.4	1,475.3	(797.3)	(183.5)	1,995.6	32.5
Balance, common stock shares at Dec. 31, 2016		394.3
Balance at Dec. 31, 2016	2,056.7		39.4	1,199.2	1,804.3	(962.5)	(63.3)	2,017.1	39.6
NET INCOME	112.7
Net income available to IPG common stockholders	116.2				116.2			116.2
Net income attributable to noncontrolling interest	(3.5)								(3.5)
Other comprehensive income (loss)	89					88.3		88.3
Other comprehensive income (loss), attributable to noncontrolling interest									0.7
Reclassifications related to redeemable noncontrolling interests	5								5
Distributions to noncontrolling interests	(11.4)								(11.4)
Change in redemption value of redeemable noncontrolling interests	(3.4)				(3.4)			(3.4)
Repurchase of common stock	(115)						(115)	(115)
Common stock dividend	(141.4)				(141.4)			(141.4)
Stock-based compensation, shares		5.5
Stock-based compensation, value	47.9		0.6	47.3				47.9
Exercise of stock options, shares		1.1
Exercise of stock options, value	11.9		0.1	11.8				11.9
Shares withheld for taxes, shares		(1.6)
Shares withheld for taxes, value	(38.4)		(0.2)	(38.2)				(38.4)
Other	(1.3)			0.1	(0.8)			(0.7)	(0.6)
Balance, common stock shares at Jun. 30, 2017		399.3
Balance at Jun. 30, 2017	$ 2,012.3		$ 39.9	$ 1,220.2	$ 1,774.9	$ (874.2)	$ (178.3)	$ 1,982.5	$ 29.8

Basis of Presentation (Notes)

Basis of Presentation (Notes)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [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 2016 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. Certain reclassifications and immaterial revisions have been made to prior-period financial statements to conform to the current-period presentation.

Debt and Credit Arrangements (N

Debt and Credit Arrangements (Notes)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt and Credit Arrangements	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 June 30, December 31, Book Value Fair Value 1 Book Value Fair Value 1 2.25% Senior Notes due 2017 (less unamortized discount and issuance costs of $0.0 and $0.2, respectively) 2.30% $ 299.8 $ 300.5 $ 299.4 $ 301.4 4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $1.5 and $1.2, respectively) 4.13% 247.3 259.0 247.0 258.4 3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.9 and $2.3, respectively) 4.32% 496.8 521.0 496.6 503.3 4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.7 and $2.8, respectively) 4.24% 496.5 526.6 496.2 511.6 Other notes payable and capitalized leases 44.4 44.4 65.4 65.4 Total long-term debt 1,584.8 1,604.6 Less: current portion 301.7 323.9 Long-term debt, excluding current portion $ 1,283.1 $ 1,280.7 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, which has been amended and restated from time to time (the "Credit Agreement"). We use our Credit Agreement to increase our financial flexibility, to provide letters of credit primarily to support obligations of our subsidiaries and to support our commercial paper program. The Credit Agreement is a revolving facility, expiring in October 2020 , 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 specified 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 specified currencies. Our obligations under the Credit Agreement are unsecured. As of June 30, 2017 , there were no borrowings under the Credit Agreement; however, we had $8.4 of letters of credit under the Credit Agreement, which reduced our total availability to $991.6 . We were in compliance with all of our covenants in the Credit Agreement as of June 30, 2017 . We also have uncommitted lines of credit with various banks which permit borrowings at variable interest rates and which are primarily used to fund working capital needs. We have guaranteed the repayment of some of these borrowings made by certain subsidiaries. If we lose access to these credit lines, we would have to provide funding directly to some of our international operations. As of June 30, 2017 , the Company had uncommitted lines of credit in an aggregate amount of $906.5 , under which we had outstanding borrowings of $237.7 classified as short-term borrowings on our Consolidated Balance Sheet. The average amount outstanding during the second quarter of 2017 was $457.6 , with a weighted-average interest rate of approximately 2.2% . Commercial Paper In June 2017 , the Company established a commercial paper program under which the Company may issue unsecured commercial paper up to a maximum aggregate amount outstanding at any time of $1,000.0 . Borrowings under the program are supported by the Credit Agreement described above. Proceeds of the commercial paper will be used for working capital and general corporate purposes, including the repayment of maturing indebtedness and other short-term liquidity needs. The maturities of the commercial paper vary but may not exceed 397 days from the date of issue. As of June 30, 2017 , there was no commercial paper outstanding. From the date the program was first utilized through June 30, 2017 , the average amount outstanding under the program was $203.7 , with a weighted-average interest rate of 1.4% and a weighted-average maturity of seven days.

Earnings Per Share (Notes)

Earnings Per Share (Notes)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings Per Share The following sets forth basic and diluted earnings per common share available to IPG common stockholders. Three months ended Six months ended 2017 2016 2017 2016 Net income available to IPG common stockholders $ 94.7 $ 156.9 $ 116.2 $ 162.3 Weighted-average number of common shares outstanding - basic 392.3 400.1 392.0 400.4 Add: Effect of dilutive securities Restricted stock, stock options and other equity awards 8.0 9.7 7.6 9.0 Weighted-average number of common shares outstanding - diluted 400.3 409.8 399.6 409.4 Earnings per share available to IPG common stockholders: Basic $ 0.24 $ 0.39 $ 0.30 $ 0.41 Diluted $ 0.24 $ 0.38 $ 0.29 $ 0.40

Acquisitions (Notes)

Acquisitions (Notes)	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions We continue to evaluate strategic opportunities to expand our industry expertise, strengthen our position in high-growth and key strategic geographical markets and industry sectors, advance our technological capabilities and improve our operational efficiency through both acquisitions and increased ownership interests in current investments. Our acquisitions typically provide for an initial payment at the time of closing and additional contingent purchase price payments based on the future performance of the acquired entity. We have entered into agreements that may require us to purchase additional equity interests in certain consolidated and unconsolidated subsidiaries. The amounts at which we record these transactions in our financial statements are based on estimates of the future financial performance of the acquired entity, the timing of the exercise of these rights, foreign currency exchange rates and other factors. During the first half of 2017 , we completed three acquisitions, including a content creation and marketing agency based in the Netherlands, an independent media agency and digital consultancy based in Finland, and an integrated marketing communications agency based in Canada. All three of our acquisitions were included in the Integrated Agency Networks ("IAN") operating segment. During the first half of 2017 , we recorded approximately $22.9 of goodwill and intangible assets related to our acquisitions. During the first half of 2016, we completed four acquisitions, including a product and service design consultancy based in the U.S., an integrated healthcare marketing communications agency based in the U.S., a content creation and digital agency with offices in the U.S. and the U.K., and a mobile consultancy and application development agency based in the U.K. Of our four acquisitions, one was included in the IAN operating segment, and three were included in the Constituency Management Group ("CMG") operating segment. During the first half of 2016, we recorded approximately $75.7 of goodwill and intangible assets related to our acquisitions, primarily in CMG. The results of operations of our acquired companies were included in our consolidated results from the closing date of each acquisition. Details of cash paid for current and prior years' acquisitions are listed below. Six months ended 2017 2016 Cost of investment: current-year acquisitions $ 14.8 $ 36.5 Cost of investment: prior-year acquisitions 37.1 29.7 Less: net cash acquired (3.0 ) (2.7 ) Total cost of investment 48.9 63.5 Operating payments 1 34.7 17.4 Total cash paid for acquisitions 2 $ 83.6 $ 80.9 1 Represents cash payments for amounts that have been recognized in operating expenses since the date of acquisition either relating to adjustments to estimates in excess of the initial value of contingent payments recorded or were contingent upon the future employment of the former owners of the acquired companies. Amounts are reflected in the operating section of the unaudited Consolidated Statements of Cash Flows. 2 Of the total cash paid for acquisitions, $12.6 and $34.3 for the six months ended June 30, 2017 and 2016 , respectively, are classified under the investing section of the unaudited Consolidated Statements of Cash Flows, as acquisitions, net of cash acquired. These amounts relate to initial payments for new transactions. Of the total cash paid for acquisitions, $36.3 and $29.2 for the six months ended June 30, 2017 and 2016 , respectively, are classified under the financing section of the unaudited Consolidated Statements of Cash Flows as acquisition-related payments. These amounts relate to deferred payments and increases in our ownership interest for prior acquisitions. Many of our acquisitions include provisions under which the noncontrolling equity owners may require us to purchase additional interests in a subsidiary at their discretion. Redeemable noncontrolling interests are adjusted quarterly to their estimated redemption value, but not less than their initial fair value. Any adjustments to the redemption value impact retained earnings, except for foreign currency translation adjustments. The following table presents changes in our redeemable noncontrolling interests. Six months ended 2017 2016 Balance at beginning of period $ 252.8 $ 251.9 Change in related noncontrolling interests balance (6.5 ) (2.6 ) Changes in redemption value of redeemable noncontrolling interests: Additions 3.0 0.0 Redemptions and other (13.2 ) (9.7 ) Redemption value adjustments 7.3 6.7 Balance at end of period $ 243.4 $ 246.3

Supplementary Data (Notes)

Supplementary Data (Notes)	6 Months Ended
	Jun. 30, 2017
Supplementary Data [Abstract]
Accrued Liabilities	Accrued Liabilities The following table presents the components of accrued liabilities. June 30, December 31, Salaries, benefits and related expenses $ 301.4 $ 499.0 Acquisition obligations 56.8 77.5 Office and related expenses 45.4 46.7 Interest 17.1 17.3 Other 92.4 153.5 Total accrued liabilities $ 513.1 $ 794.0
Other Income, Net	Other (Expense) Income, Net Results of operations for the three and six months ended June 30, 2017 and 2016 include certain items that are not directly associated with our revenue-producing operations. Three months ended Six months ended 2017 2016 2017 2016 Net losses on sales of businesses and investments $ (13.1 ) $ (2.2 ) $ (12.1 ) $ (18.5 ) Other (expense) income, net (2.3 ) 2.6 (2.5 ) (0.3 ) Total other (expense) income, net $ (15.4 ) $ 0.4 $ (14.6 ) $ (18.8 ) Net Losses on Sales of Businesses and Investments – During the three and six months ended June 30, 2017 and 2016, the amounts recognized were related to sales of businesses and the classification of certain assets and liabilities, consisting primarily of accounts receivable and accounts payable, respectively, as held for sale within our IAN operating segment.
Share Repurchase Program	Share Repurchase Program In February 2017, 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 2016. 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 six months ended June 30, 2017 and 2016 . Six months ended 2017 2016 Number of shares repurchased 4.8 5.0 Aggregate cost, including fees $ 115.0 $ 112.5 Average price per share, including fees $ 24.13 $ 22.47 As of June 30, 2017 , $340.4 , excluding fees, remains available for repurchase under the share repurchase programs. The share repurchase programs have no expiration date.

Income Taxes (Notes)

Income Taxes (Notes)	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three and six months ended June 30, 2017 , our effective income tax rates of 44.3% and 39.6% , respectively, were negatively impacted by losses in certain foreign jurisdictions where we receive no tax benefit due to 100% valuation allowances and by losses on sales of businesses, and the classification of certain assets as held for sale, for which we did not receive a full tax benefit. For the six months ended June 30, 2017 , our effective income tax rate was positively impacted by excess tax benefits on employee share-based payments, the majority of which is typically recognized in the first quarter due to the timing of the vesting of awards. 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 through 2012, with the exception of 2009. With limited exceptions, we are no longer subject to state and local income tax audits for years prior to 2007 or non-U.S. income tax audits for years prior to 2006.

Incentive Compensation Plans (N

Incentive Compensation Plans (Notes)	6 Months Ended
	Jun. 30, 2017
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Incentive Compensation Plans	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 six months ended June 30, 2017 . Awards Weighted-average grant-date fair value (per award) Stock-settled awards 0.8 $ 24.26 Performance-based awards 4.8 $ 20.06 Total stock-based compensation awards 5.6 During the six months ended June 30, 2017 , the Compensation Committee granted performance cash awards and restricted cash awards under the 2014 PIP with a total target value of $54.2 and $2.3 , respectively. Cash awards are expensed over the vesting period, which is typically three years .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss, Net of Tax (Notes)	6 Months Ended
	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [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, 2016 $ (716.7 ) $ 0.6 $ (8.4 ) $ (238.0 ) $ (962.5 ) Other comprehensive income before reclassifications 84.1 0.1 0.0 0.4 84.6 Amount reclassified from accumulated other comprehensive loss, net of tax 0.3 0.0 0.7 2.7 3.7 Balance as of June 30, 2017 $ (632.3 ) $ 0.7 $ (7.7 ) $ (234.9 ) $ (874.2 ) Foreign Currency Translation Adjustments Available-for-Sale Securities Derivative Instruments Defined Benefit Pension and Other Postretirement Plans Total Balance as of December 31, 2015 $ (665.6 ) $ 1.3 $ (9.6 ) $ (171.7 ) $ (845.6 ) Other comprehensive income before reclassifications 39.2 0.2 0.0 0.9 40.3 Amount reclassified from accumulated other comprehensive loss, net of tax 6.5 (1.2 ) 0.6 2.1 8.0 Balance as of June 30, 2016 $ (619.9 ) $ 0.3 $ (9.0 ) $ (168.7 ) $ (797.3 ) Amounts reclassified from accumulated other comprehensive loss, net of tax, for the three and six months ended June 30, 2017 and 2016 are as follows: Three months ended Six months ended Affected Line Item in the Consolidated Statements of Operations 2017 2016 2017 2016 Foreign currency translation adjustments 1 $ 0.7 $ 7.5 $ 0.3 $ 6.5 Other (expense) income, net Gains on available-for-sale securities 0.0 (1.2 ) 0.0 (1.2 ) Other (expense) income, net Losses on derivative instruments 0.6 0.5 1.1 1.0 Interest expense Amortization of defined benefit pension and postretirement plan items 1.8 0.0 3.5 2.7 Other (expense) income, net Tax effect (0.6 ) 0.1 (1.2 ) (1.0 ) Provision for income taxes Total amount reclassified from accumulated other comprehensive loss, net of tax $ 2.5 $ 6.9 $ 3.7 $ 8.0 1 These foreign currency translation adjustments are primarily a result of the sales of businesses.

Employee Benefits (Notes)

Employee Benefits (Notes)	6 Months Ended
	Jun. 30, 2017
Defined Benefit Plan [Abstract]
Employee Benefits	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 June 30, 2017 2016 2017 2016 2017 2016 Service cost $ 0.0 $ 0.0 $ 1.0 $ 2.2 $ 0.0 $ 0.0 Interest cost 1.2 1.5 3.3 4.7 0.3 0.3 Expected return on plan assets (1.5 ) (1.7 ) (4.4 ) (5.3 ) 0.0 0.0 Settlements and curtailments 0.0 0.0 0.0 0.2 0.0 0.0 Amortization of: Prior service cost 0.0 0.0 0.0 0.0 0.0 0.1 Unrecognized actuarial losses 0.4 (1.2 ) 1.4 0.9 0.0 0.0 Net periodic cost $ 0.1 $ (1.4 ) $ 1.3 $ 2.7 $ 0.3 $ 0.4 Domestic Pension Plan Foreign Pension Plans Domestic Postretirement Benefit Plan Six months ended June 30, 2017 2016 2017 2016 2017 2016 Service cost $ 0.0 $ 0.0 $ 1.9 $ 4.9 $ 0.0 $ 0.0 Interest cost 2.5 3.0 6.6 9.2 0.6 0.7 Expected return on plan assets (3.1 ) (3.4 ) (8.7 ) (10.6 ) 0.0 0.0 Settlements and curtailments 0.0 0.0 0.0 0.2 0.0 0.0 Amortization of: Prior service cost 0.0 0.0 0.0 0.0 0.0 0.0 Unrecognized actuarial losses 0.8 0.7 2.7 1.8 0.0 0.0 Net periodic cost $ 0.2 $ 0.3 $ 2.5 $ 5.5 $ 0.6 $ 0.7 The components of net periodic cost other than the service cost component are included in the line item “ Other (expense) income, net ” in the Consolidated Statements of Operations. During the six months ended June 30, 2017 , we contributed $0.3 and $8.6 of cash to our domestic and foreign pension plans, respectively. For the remainder of 2017 , we expect to contribute approximately $2.0 and $9.0 of cash to our domestic and foreign pension plans, respectively.

Segment Information (Notes)

Segment Information (Notes)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Reporting Disclosure	Segment Information As of June 30, 2017 , we have two reportable segments: IAN and CMG. IAN is comprised of McCann Worldgroup, Foote, Cone & Belding ("FCB"), MullenLowe Group, 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 2016 Annual Report on Form 10-K. Summarized financial information concerning our reportable segments is shown in the following tables. Three months ended Six months ended 2017 2016 2017 2016 Revenue: IAN $ 1,537.8 $ 1,548.5 $ 2,945.4 $ 2,950.1 CMG 347.1 369.4 693.4 709.8 Total $ 1,884.9 $ 1,917.9 $ 3,638.8 $ 3,659.9 Segment operating income (loss): IAN $ 174.4 $ 198.2 $ 218.2 $ 240.0 CMG 53.9 50.0 77.3 70.4 Corporate and other (21.8 ) (23.9 ) (59.3 ) (63.1 ) Total 206.5 224.3 236.2 247.3 Interest expense (25.7 ) (24.5 ) (46.6 ) (47.1 ) Interest income 4.7 5.6 9.9 11.4 Other (expense) income, net (15.4 ) 0.4 (14.6 ) (18.8 ) Income before income taxes $ 170.1 $ 205.8 $ 184.9 $ 192.8 Depreciation and amortization of property and equipment and intangible assets: IAN $ 30.6 $ 29.2 $ 60.1 $ 56.8 CMG 5.3 4.9 10.6 9.7 Corporate and other 5.4 5.7 11.6 11.3 Total $ 41.3 $ 39.8 $ 82.3 $ 77.8 Capital expenditures: IAN $ 31.4 $ 26.9 $ 48.6 $ 47.2 CMG 4.0 2.2 6.7 3.7 Corporate and other 8.7 6.9 13.6 12.1 Total $ 44.1 $ 36.0 $ 68.9 $ 63.0 June 30, December 31, Total assets: IAN $ 10,282.4 $ 10,660.0 CMG 1,402.3 1,428.3 Corporate and other (6.5 ) 396.9 Total $ 11,678.2 $ 12,485.2

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	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 six months ended June 30, 2017 . The following tables present information about our financial instruments measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016 , and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value. June 30, 2017 Balance Sheet Classification Level 1 Level 2 Level 3 Total Assets Cash equivalents $ 176.7 $ 0.0 $ 0.0 $ 176.7 Cash and cash equivalents Short-term marketable securities 3.2 0.0 0.0 3.2 Marketable securities Long-term investments 0.4 0.0 0.0 0.4 Other non-current assets Total $ 180.3 $ 0.0 $ 0.0 $ 180.3 As a percentage of total assets 1.5 % 0.0 % 0.0 % 1.5 % Liabilities Contingent acquisition obligations 1 $ 0.0 $ 0.0 $ 157.0 $ 157.0 December 31, 2016 Balance Sheet Classification Level 1 Level 2 Level 3 Total Assets Cash equivalents $ 440.8 $ 0.0 $ 0.0 $ 440.8 Cash and cash equivalents Short-term marketable securities 3.0 0.0 0.0 3.0 Marketable securities Long-term investments 0.4 0.0 0.0 0.4 Other non-current assets Total $ 444.2 $ 0.0 $ 0.0 $ 444.2 As a percentage of total assets 3.6 % 0.0 % 0.0 % 3.6 % Liabilities Contingent acquisition obligations 1 $ 0.0 $ 0.0 $ 205.4 $ 205.4 1 Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The decrease in this balance of $48.4 from December 31, 2016 to June 30, 2017 is primarily due to payments of $75.2 , partially offset by acquisitions and exercised options of $16.3 . The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities. 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 June 30, 2017 and December 31, 2016 , and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value. June 30, 2017 December 31, 2016 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Total long-term debt $ 0.0 $ 1,607.1 $ 44.4 $ 1,651.5 $ 0.0 $ 1,574.7 $ 65.4 $ 1,640.1 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 (

Commitments and Contingencies (Notes)	6 Months Ended
	Jun. 30, 2017
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. As previously disclosed, on April 10, 2015, a federal judge in Brazil authorized the search of the records of an agency's offices in São Paulo and Brasilia, in connection with an ongoing investigation by Brazilian authorities involving payments potentially connected to local government contracts. The Company had previously investigated the matter and taken a number of remedial and disciplinary actions. The Company is in the process of concluding a settlement related to these matters with government agencies. The Company confirmed that one of its standalone domestic agencies has been contacted by the Department of Justice Antitrust Division for documents regarding video production practices and is cooperating with the government. Guarantees As discussed in our 2016 Annual Report on Form 10-K, we have guaranteed certain obligations of our subsidiaries relating principally to operating leases and uncommitted lines of credit of certain subsidiaries. The amount of parent company guarantees on lease obligations was $824.1 and $857.3 as of June 30, 2017 and December 31, 2016 , respectively, and the amount of parent company guarantees primarily relating to uncommitted lines of credit was $399.8 and $395.6 as of June 30, 2017 and December 31, 2016 , respectively.

Recent Accounting Standards (No

Recent Accounting Standards (Notes)	6 Months Ended
	Jun. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Standards	Recent Accounting Standards Accounting pronouncements not listed below were assessed and determined to be not applicable or are expected to have minimal impact on our Consolidated Financial Statements. Pensions In March 2017, the Financial Accounting Standards Board (the "FASB") issued amended guidance which requires presentation of all net periodic pension and postretirement benefit costs, other than service costs, in non-operating expenses in the Consolidated Statement of Operations. We have early adopted this amended guidance retrospectively as of the quarter ended March 31, 2017 using the practical expedient, which permits the use of amounts disclosed in our Employee Benefits note for prior comparative periods as the estimation basis for applying the retrospective presentation requirements. This resulted in the reclassification of a portion of postretirement costs/(benefits) from "Salaries and related expenses" to "Other (expense) income, net" in the amount of $0.8 and ($0.5) for the three months ended June 30, 2017 and 2016 , respectively, and $1.6 for the six months ended June 30, 2017 and 2016 . Restricted Cash In November 2016, the FASB issued amended guidance which requires that the Consolidated Statement of Cash Flows present the change during the period in the total cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. We have early adopted this amended guidance retrospectively as of the quarter ended March 31, 2017. The Consolidated Statements of Cash Flows for the six months ended June 30, 2017 and 2016 now include restricted cash balances of $2.5 and $3.2 , respectively, in the beginning-of-period totals and $2.3 and $3.1 , respectively, in the end-of-period totals. Financial Instrument Credit Losses In June 2016, the FASB issued amended guidance on the accounting for credit losses on certain types of financial instruments, including trade receivables. The new model uses a forward-looking expected loss method, as opposed to the incurred loss method in current U.S. GAAP, which will generally result in earlier recognition of allowances for losses. This amended guidance is effective beginning January 1, 2020, with early adoption permitted as early as January 1, 2019. We are currently assessing the impact the adoption of the amended guidance will have on our Consolidated Financial Statements. Leases In February 2016, the FASB issued amended guidance on lease accounting which requires an entity to recognize a right-of-use asset and a corresponding lease liability on its balance sheet for virtually all of its leases with a term of more than 12 months, including those classified as operating leases. Both the asset and liability will initially be measured at the present value of the future minimum lease payments, with the asset being subject to adjustments such as initial direct costs. Consistent with current U.S. GAAP, the presentation of expenses and cash flows will depend primarily on the classification of the lease as either a finance or an operating lease. The new standard also requires additional quantitative and qualitative disclosures regarding the amount, timing and uncertainty of cash flows arising from leases in order to provide additional information about the nature of an organization’s leasing activities. This amended guidance, which will be effective beginning January 1, 2019, requires modified retrospective application, with early adoption permitted. We expect the adoption of this amended guidance to have a significant impact on our Consolidated Balance Sheets but not on our Consolidated Statements of Operations. Fair Value Measurements In January 2016, the FASB issued amended guidance which updates the fair value presentation requirements for certain financial instruments. Equity investments with readily determinable fair values, other than those accounted for using the equity method of accounting, will be measured at fair value with changes recorded through current earnings rather than other comprehensive income. This amended guidance will be effective for us beginning January 1, 2018, and is required to be adopted prospectively with a cumulative-effect adjustment recorded on our Consolidated Balance Sheets, if applicable. We do not expect the adoption of this amended guidance to have a significant impact on our Consolidated Financial Statements. Revenue Recognition In May 2014, the FASB issued amended guidance on revenue recognition which requires an entity 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 and services. We expect to adopt the standard, which is effective January 1, 2018, using the full retrospective method; however, that determination is subject to the completion of our analysis of certain items. While we continue to assess all potential impacts of the standard, we currently expect an impact to the timing of revenue recognition between quarters, primarily as a result of estimating variable consideration. We have determined that the standard will result in an increase in the number of performance obligations within certain of our contractual arrangements. The standard will also result in an increase in third party costs being included in revenue, primarily in connection with our events businesses, and certain out-of-pocket expenses reimbursed by clients no longer being included in revenue, the results of which will have no impact on operating income or net income. Additionally, we continue to evaluate the disclosures that may be required.

Debt and Credit Arrangements (T

Debt and Credit Arrangements (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [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 June 30, December 31, Book Value Fair Value 1 Book Value Fair Value 1 2.25% Senior Notes due 2017 (less unamortized discount and issuance costs of $0.0 and $0.2, respectively) 2.30% $ 299.8 $ 300.5 $ 299.4 $ 301.4 4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $1.5 and $1.2, respectively) 4.13% 247.3 259.0 247.0 258.4 3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.9 and $2.3, respectively) 4.32% 496.8 521.0 496.6 503.3 4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.7 and $2.8, respectively) 4.24% 496.5 526.6 496.2 511.6 Other notes payable and capitalized leases 44.4 44.4 65.4 65.4 Total long-term debt 1,584.8 1,604.6 Less: current portion 301.7 323.9 Long-term debt, excluding current portion $ 1,283.1 $ 1,280.7 1 See Note 11 for information on the fair value measurement of our long-term debt.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following sets forth basic and diluted earnings per common share available to IPG common stockholders. Three months ended Six months ended 2017 2016 2017 2016 Net income available to IPG common stockholders $ 94.7 $ 156.9 $ 116.2 $ 162.3 Weighted-average number of common shares outstanding - basic 392.3 400.1 392.0 400.4 Add: Effect of dilutive securities Restricted stock, stock options and other equity awards 8.0 9.7 7.6 9.0 Weighted-average number of common shares outstanding - diluted 400.3 409.8 399.6 409.4 Earnings per share available to IPG common stockholders: Basic $ 0.24 $ 0.39 $ 0.30 $ 0.41 Diluted $ 0.24 $ 0.38 $ 0.29 $ 0.40

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Cash Paid For Current And Prior Years' Acquisitions [Table Text Block]	The results of operations of our acquired companies were included in our consolidated results from the closing date of each acquisition. Details of cash paid for current and prior years' acquisitions are listed below. Six months ended 2017 2016 Cost of investment: current-year acquisitions $ 14.8 $ 36.5 Cost of investment: prior-year acquisitions 37.1 29.7 Less: net cash acquired (3.0 ) (2.7 ) Total cost of investment 48.9 63.5 Operating payments 1 34.7 17.4 Total cash paid for acquisitions 2 $ 83.6 $ 80.9 1 Represents cash payments for amounts that have been recognized in operating expenses since the date of acquisition either relating to adjustments to estimates in excess of the initial value of contingent payments recorded or were contingent upon the future employment of the former owners of the acquired companies. Amounts are reflected in the operating section of the unaudited Consolidated Statements of Cash Flows. 2 Of the total cash paid for acquisitions, $12.6 and $34.3 for the six months ended June 30, 2017 and 2016 , respectively, are classified under the investing section of the unaudited Consolidated Statements of Cash Flows, as acquisitions, net of cash acquired. These amounts relate to initial payments for new transactions. Of the total cash paid for acquisitions, $36.3 and $29.2 for the six months ended June 30, 2017 and 2016 , respectively, are classified under the financing section of the unaudited Consolidated Statements of Cash Flows as acquisition-related payments. These amounts relate to deferred payments and increases in our ownership interest for prior acquisitions.
Redeemable Noncontrolling Interest [Table Text Block]	The following table presents changes in our redeemable noncontrolling interests. Six months ended 2017 2016 Balance at beginning of period $ 252.8 $ 251.9 Change in related noncontrolling interests balance (6.5 ) (2.6 ) Changes in redemption value of redeemable noncontrolling interests: Additions 3.0 0.0 Redemptions and other (13.2 ) (9.7 ) Redemption value adjustments 7.3 6.7 Balance at end of period $ 243.4 $ 246.3

Supplementary Data (Tables)

Supplementary Data (Tables)	6 Months Ended
	Jun. 30, 2017
Supplementary Data [Abstract]
Accrued Liabilities	The following table presents the components of accrued liabilities. June 30, December 31, Salaries, benefits and related expenses $ 301.4 $ 499.0 Acquisition obligations 56.8 77.5 Office and related expenses 45.4 46.7 Interest 17.1 17.3 Other 92.4 153.5 Total accrued liabilities $ 513.1 $ 794.0
Other Income (Expense), Net	Results of operations for the three and six months ended June 30, 2017 and 2016 include certain items that are not directly associated with our revenue-producing operations. Three months ended Six months ended 2017 2016 2017 2016 Net losses on sales of businesses and investments $ (13.1 ) $ (2.2 ) $ (12.1 ) $ (18.5 ) Other (expense) income, net (2.3 ) 2.6 (2.5 ) (0.3 ) Total other (expense) income, net $ (15.4 ) $ 0.4 $ (14.6 ) $ (18.8 )
Share Repurchase Program	The following table presents our share repurchase activity under our share repurchase programs for the six months ended June 30, 2017 and 2016 . Six months ended 2017 2016 Number of shares repurchased 4.8 5.0 Aggregate cost, including fees $ 115.0 $ 112.5 Average price per share, including fees $ 24.13 $ 22.47

Incentive Compensation Plans (T

Incentive Compensation Plans (Tables)	6 Months Ended
	Jun. 30, 2017
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 six months ended June 30, 2017 . Awards Weighted-average grant-date fair value (per award) Stock-settled awards 0.8 $ 24.26 Performance-based awards 4.8 $ 20.06 Total stock-based compensation awards 5.6

Accumulated Other Comprehensi25

Accumulated Other Comprehensive Loss, Net of Tax (Tables)	6 Months Ended
	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	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, 2016 $ (716.7 ) $ 0.6 $ (8.4 ) $ (238.0 ) $ (962.5 ) Other comprehensive income before reclassifications 84.1 0.1 0.0 0.4 84.6 Amount reclassified from accumulated other comprehensive loss, net of tax 0.3 0.0 0.7 2.7 3.7 Balance as of June 30, 2017 $ (632.3 ) $ 0.7 $ (7.7 ) $ (234.9 ) $ (874.2 ) Foreign Currency Translation Adjustments Available-for-Sale Securities Derivative Instruments Defined Benefit Pension and Other Postretirement Plans Total Balance as of December 31, 2015 $ (665.6 ) $ 1.3 $ (9.6 ) $ (171.7 ) $ (845.6 ) Other comprehensive income before reclassifications 39.2 0.2 0.0 0.9 40.3 Amount reclassified from accumulated other comprehensive loss, net of tax 6.5 (1.2 ) 0.6 2.1 8.0 Balance as of June 30, 2016 $ (619.9 ) $ 0.3 $ (9.0 ) $ (168.7 ) $ (797.3 )
Reclassification out of Accumulated Other Comprehensive Income	Amounts reclassified from accumulated other comprehensive loss, net of tax, for the three and six months ended June 30, 2017 and 2016 are as follows: Three months ended Six months ended Affected Line Item in the Consolidated Statements of Operations 2017 2016 2017 2016 Foreign currency translation adjustments 1 $ 0.7 $ 7.5 $ 0.3 $ 6.5 Other (expense) income, net Gains on available-for-sale securities 0.0 (1.2 ) 0.0 (1.2 ) Other (expense) income, net Losses on derivative instruments 0.6 0.5 1.1 1.0 Interest expense Amortization of defined benefit pension and postretirement plan items 1.8 0.0 3.5 2.7 Other (expense) income, net Tax effect (0.6 ) 0.1 (1.2 ) (1.0 ) Provision for income taxes Total amount reclassified from accumulated other comprehensive loss, net of tax $ 2.5 $ 6.9 $ 3.7 $ 8.0 1 These foreign currency translation adjustments are primarily a result of the sales of businesses.

Employee Benefits (Tables)

Employee Benefits (Tables)	6 Months Ended
	Jun. 30, 2017
Defined Benefit Plan [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 June 30, 2017 2016 2017 2016 2017 2016 Service cost $ 0.0 $ 0.0 $ 1.0 $ 2.2 $ 0.0 $ 0.0 Interest cost 1.2 1.5 3.3 4.7 0.3 0.3 Expected return on plan assets (1.5 ) (1.7 ) (4.4 ) (5.3 ) 0.0 0.0 Settlements and curtailments 0.0 0.0 0.0 0.2 0.0 0.0 Amortization of: Prior service cost 0.0 0.0 0.0 0.0 0.0 0.1 Unrecognized actuarial losses 0.4 (1.2 ) 1.4 0.9 0.0 0.0 Net periodic cost $ 0.1 $ (1.4 ) $ 1.3 $ 2.7 $ 0.3 $ 0.4 Domestic Pension Plan Foreign Pension Plans Domestic Postretirement Benefit Plan Six months ended June 30, 2017 2016 2017 2016 2017 2016 Service cost $ 0.0 $ 0.0 $ 1.9 $ 4.9 $ 0.0 $ 0.0 Interest cost 2.5 3.0 6.6 9.2 0.6 0.7 Expected return on plan assets (3.1 ) (3.4 ) (8.7 ) (10.6 ) 0.0 0.0 Settlements and curtailments 0.0 0.0 0.0 0.2 0.0 0.0 Amortization of: Prior service cost 0.0 0.0 0.0 0.0 0.0 0.0 Unrecognized actuarial losses 0.8 0.7 2.7 1.8 0.0 0.0 Net periodic cost $ 0.2 $ 0.3 $ 2.5 $ 5.5 $ 0.6 $ 0.7

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Summarized financial information concerning our reportable segments is shown in the following tables. Three months ended Six months ended 2017 2016 2017 2016 Revenue: IAN $ 1,537.8 $ 1,548.5 $ 2,945.4 $ 2,950.1 CMG 347.1 369.4 693.4 709.8 Total $ 1,884.9 $ 1,917.9 $ 3,638.8 $ 3,659.9 Segment operating income (loss): IAN $ 174.4 $ 198.2 $ 218.2 $ 240.0 CMG 53.9 50.0 77.3 70.4 Corporate and other (21.8 ) (23.9 ) (59.3 ) (63.1 ) Total 206.5 224.3 236.2 247.3 Interest expense (25.7 ) (24.5 ) (46.6 ) (47.1 ) Interest income 4.7 5.6 9.9 11.4 Other (expense) income, net (15.4 ) 0.4 (14.6 ) (18.8 ) Income before income taxes $ 170.1 $ 205.8 $ 184.9 $ 192.8 Depreciation and amortization of property and equipment and intangible assets: IAN $ 30.6 $ 29.2 $ 60.1 $ 56.8 CMG 5.3 4.9 10.6 9.7 Corporate and other 5.4 5.7 11.6 11.3 Total $ 41.3 $ 39.8 $ 82.3 $ 77.8 Capital expenditures: IAN $ 31.4 $ 26.9 $ 48.6 $ 47.2 CMG 4.0 2.2 6.7 3.7 Corporate and other 8.7 6.9 13.6 12.1 Total $ 44.1 $ 36.0 $ 68.9 $ 63.0 June 30, December 31, Total assets: IAN $ 10,282.4 $ 10,660.0 CMG 1,402.3 1,428.3 Corporate and other (6.5 ) 396.9 Total $ 11,678.2 $ 12,485.2

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 and December 31, 2016 , and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value. June 30, 2017 Balance Sheet Classification Level 1 Level 2 Level 3 Total Assets Cash equivalents $ 176.7 $ 0.0 $ 0.0 $ 176.7 Cash and cash equivalents Short-term marketable securities 3.2 0.0 0.0 3.2 Marketable securities Long-term investments 0.4 0.0 0.0 0.4 Other non-current assets Total $ 180.3 $ 0.0 $ 0.0 $ 180.3 As a percentage of total assets 1.5 % 0.0 % 0.0 % 1.5 % Liabilities Contingent acquisition obligations 1 $ 0.0 $ 0.0 $ 157.0 $ 157.0 December 31, 2016 Balance Sheet Classification Level 1 Level 2 Level 3 Total Assets Cash equivalents $ 440.8 $ 0.0 $ 0.0 $ 440.8 Cash and cash equivalents Short-term marketable securities 3.0 0.0 0.0 3.0 Marketable securities Long-term investments 0.4 0.0 0.0 0.4 Other non-current assets Total $ 444.2 $ 0.0 $ 0.0 $ 444.2 As a percentage of total assets 3.6 % 0.0 % 0.0 % 3.6 % Liabilities Contingent acquisition obligations 1 $ 0.0 $ 0.0 $ 205.4 $ 205.4 1 Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The decrease in this balance of $48.4 from December 31, 2016 to June 30, 2017 is primarily due to payments of $75.2 , partially offset by acquisitions and exercised options of $16.3 . The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis	The following table presents information about our financial instruments that are not measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016 , and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value. June 30, 2017 December 31, 2016 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Total long-term debt $ 0.0 $ 1,607.1 $ 44.4 $ 1,651.5 $ 0.0 $ 1,574.7 $ 65.4 $ 1,640.1

Long-term Debt (Details)

Long-term Debt (Details) - USD ($) $ in Millions		3 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 1,584.8	$ 1,604.6
Long-term Debt, Current Maturities		301.7	323.9
Long-term Debt, Excluding Current Maturities		$ 1,283.1	1,280.7
2.25% Notes
Debt Instrument [Line Items]
Debt Instrument, Maturity Date		Nov. 15, 2017
Debt Instrument, Interest Rate, Stated Percentage		2.25%
Debt Instrument, Interest Rate, Effective Percentage		2.30%
Debt Instrument, Unamortized Discount		$ 0
Debt Instrument, Unamortized Debt Issuance Costs		0.2
Long-term Debt, Gross		299.8	299.4
Long-term Debt, Fair Value	[1]	$ 300.5	301.4
4.00% Notes
Debt Instrument [Line Items]
Debt Instrument, Maturity Date		Mar. 15, 2022
Debt Instrument, Interest Rate, Stated Percentage		4.00%
Debt Instrument, Interest Rate, Effective Percentage		4.13%
Debt Instrument, Unamortized Discount		$ 1.5
Debt Instrument, Unamortized Debt Issuance Costs		1.2
Long-term Debt, Gross		247.3	247
Long-term Debt, Fair Value	[1]	$ 259	258.4
3.75% Notes
Debt Instrument [Line Items]
Debt Instrument, Maturity Date		Feb. 15, 2023
Debt Instrument, Interest Rate, Stated Percentage		3.75%
Debt Instrument, Interest Rate, Effective Percentage		4.32%
Debt Instrument, Unamortized Discount		$ 0.9
Debt Instrument, Unamortized Debt Issuance Costs		2.3
Long-term Debt, Gross		496.8	496.6
Long-term Debt, Fair Value	[1]	$ 521	503.3
4.20% Notes
Debt Instrument [Line Items]
Debt Instrument, Maturity Date		Apr. 15, 2024
Debt Instrument, Interest Rate, Stated Percentage		4.20%
Debt Instrument, Interest Rate, Effective Percentage		4.24%
Debt Instrument, Unamortized Discount		$ 0.7
Debt Instrument, Unamortized Debt Issuance Costs		2.8
Long-term Debt, Gross		496.5	496.2
Long-term Debt, Fair Value	[1]	526.6	511.6
Other notes payable and capitalized leases
Debt Instrument [Line Items]
Long-term Debt, Gross		44.4	65.4
Long-term Debt, Fair Value	[1]	$ 44.4	$ 65.4
[1]	See Note 11 for information on the fair value measurement of our long-term debt.

Debt and Credit Arrangements Co

Debt and Credit Arrangements Committed and Uncommitted Credit Facility (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017USD ($)
Committed credit facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date	Oct. 20, 2020
Line of credit facility, current borrowing capacity	$ 1,000
Line of credit facility, available capacity increase amount	250
Line of credit facility, limits on letters of credit	200
Line of credit outstanding, amount	0
Letters of credit outstanding, amount	8.4
Line of credit facility, remaining borrowing capacity	991.6
Uncommitted credit facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	906.5
Line of credit outstanding, amount	237.7
Line of credit facility, average outstanding amount	$ 457.6
Line of credit facility, weighted average interest rate	2.20%

Debt and Credit Arrangements 31

Debt and Credit Arrangements Commercial Paper (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017USD ($)
Debt Disclosure [Abstract]
Commercial paper borrowing capacity	$ 1,000
Commercial paper, maximum allowable maturity period	397 days
Commercial paper outstanding, amount	$ 0
Commercial paper, average outstanding amount	$ 203.7
Commercial paper, weighted average interest rate	1.40%
Commercial paper, weighted average maturity days	7

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income available to IPG common stockholders	$ 94.7	$ 156.9	$ 116.2	$ 162.3
Weighted-average number of common shares outstanding, Basic	392.3	400.1	392	400.4
Restricted stock, stock options and other equity awards	8	9.7	7.6	9
Weighted-average number of common shares outstanding, Diluted	400.3	409.8	399.6	409.4
Earnings per share, Basic	$ 0.24	$ 0.39	$ 0.30	$ 0.41
Earnings per share, Diluted	$ 0.24	$ 0.38	$ 0.29	$ 0.40

Acquisitions Narrative (Details

Acquisitions Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)
Goodwill and intangible assets related to acquisitions	$ 22.9	$ 75.7
Number of Businesses Acquired	3	4
IAN
Number of Businesses Acquired	3	1
CMG
Number of Businesses Acquired		3

Acquisitions Cash Paid for Acqu

Acquisitions Cash Paid for Acquisitions (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Cash Paid for Acquisitions [Abstract]
Cost of investment: current-year acquisitions		$ 14.8	$ 36.5
Cost of investment: prior-year acquisitions		37.1	29.7
Less: net cash acquired		(3)	(2.7)
Total cost of investment		48.9	63.5
Operating payments	[1]	34.7	17.4
Total cash paid for acquisitions	[2]	83.6	80.9
Payments for initial acquisitions, Investing Cash Flows		12.6	34.3
Payments for previous acquisitions, Financing Cash Flows		$ 36.3	$ 29.2
[1]	Represents cash payments for amounts that have been recognized in operating expenses since the date of acquisition either relating to adjustments to estimates in excess of the initial value of contingent payments recorded or were contingent upon the future employment of the former owners of the acquired companies. Amounts are reflected in the operating section of the unaudited Consolidated Statements of Cash Flows.
[2]	Of the total cash paid for acquisitions, $12.6 and $34.3 for the six months ended June 30, 2017 and 2016, respectively, are classified under the investing section of the unaudited Consolidated Statements of Cash Flows, as acquisitions, net of cash acquired. These amounts relate to initial payments for new transactions. Of the total cash paid for acquisitions, $36.3 and $29.2 for the six months ended June 30, 2017 and 2016, respectively, are classified under the financing section of the unaudited Consolidated Statements of Cash Flows as acquisition-related payments. These amounts relate to deferred payments and increases in our ownership interest for prior acquisitions.

Acquisitions Redeemable Noncont

Acquisitions Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Redeemable Noncontrolling Interests
Balance at beginning of period	$ 252.8	$ 251.9
Change in related noncontrolling interest balance	(6.5)	(2.6)
Changes in redemption value of redeemable noncontrolling interests:
Additions	3	0
Redemptions and reclassifications	(13.2)	(9.7)
Redemption value adjustments	7.3	6.7
Balance at end of period	$ 243.4	$ 246.3

Supplementary Data Accrued Liab

Supplementary Data Accrued Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Accrued Liabilities [Abstract]
Salaries, benefits and related expenses	$ 301.4	$ 499
Acquisition obligations	56.8	77.5
Office and related expenses	45.4	46.7
Interest	17.1	17.3
Other	92.4	153.5
Total accrued liabilities	$ 513.1	$ 794

Supplementary Data Other (Expen

Supplementary Data Other (Expense) Income , Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Net losses on sales of businesses and investments	$ (13.1)	$ (2.2)	$ (12.1)	$ (18.5)
Other (expense) income, net	(2.3)	2.6	(2.5)	(0.3)
Total other (expense) income, net	$ (15.4)	$ 0.4	$ (14.6)	$ (18.8)

Supplementary Data Share Repurc

Supplementary Data Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Feb. 10, 2017	Feb. 12, 2016
Disclosure of Repurchase Agreements [Abstract]
Stock repurchase program, authorized amount			$ 300	$ 300
Number of shares repurchased	4.8	5
Aggregate cost, including fees	$ 115	$ 112.5
Average price per share, including fees	$ 24.13	$ 22.47
Stock repurchase program, remaining authorized repurchase amount, excluding fees	$ 340.4

Income Taxes Income Taxes Narra

Income Taxes Income Taxes Narrative (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	44.30%	39.60%

Income Taxes Change in Unrecogn

Income Taxes Change in Unrecognized Tax Benefits (Details) $ in Millions	Jun. 30, 2017USD ($)
Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	$ 35
Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	$ 25

Incentive Compensation Plans St

Incentive Compensation Plans Stock-based Compensation Awards (Details) shares in Millions	6 Months Ended
	Jun. 30, 2017$ / sharesshares
Stock-settled awards
Incentive Compensation Plans
Granted awards	0.8
Weighted average grant date fair value | $ / shares	$ 24.26
Performance based awards
Incentive Compensation Plans
Granted awards	4.8
Weighted average grant date fair value | $ / shares	$ 20.06
Total stock-based compensation awards
Incentive Compensation Plans
Granted awards	5.6

Incentive Compensation Plans Pl

Incentive Compensation Plans Plan Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Performance cash awards granted during the period target value	$ 54.2
Restricted cash awards granted during the period target value	$ 2.3
Cash awards vesting period	3 years

Accumulated Other Comprehensi43

Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Foreign currency translation adjustment:
Balance at beginning of period	$ (716.7)	$ (665.6)
Other comprehensive income before reclassifications	84.1	39.2
Amount reclassified from accumulated other comprehensive loss, net of tax	0.3	6.5
Balance at end of period	(632.3)	(619.9)
Available-for-sale securities:
Balance at beginning of period	0.6	1.3
Other comprehensive income before reclassifications	0.1	0.2
Amount reclassified from accumulated other comprehensive loss, net of tax	0	(1.2)
Balance at end of period	0.7	0.3
Derivative instruments:
Balance at beginning of period	(8.4)	(9.6)
Other comprehensive income before reclassifications	0	0
Amount reclassified from accumulated other comprehensive loss, net of tax	0.7	0.6
Balance at end of period	(7.7)	(9)
Defined benefit pension and other postretirement plans:
Balance at beginning of period	(238)	(171.7)
Other comprehensive income before reclassifications	0.4	0.9
Amount reclassified from accumulated other comprehensive loss,net of tax	2.7	2.1
Balance at end of period	(234.9)	(168.7)
Total:
Balance at beginning of period	(962.5)	(845.6)
Other comprehensive income before reclassifications	84.6	40.3
Amount reclassified from accumulated other comprehensive loss, net of tax	3.7	8
Balance at end of period	$ (874.2)	$ (797.3)

Accumulated Other Comprehensi44

Accumulated Other Comprehensive Loss, Net of Tax Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	[1]	$ 0.7	$ 7.5	$ 0.3	$ 6.5
Gains on available-for-sale securities		0	(1.2)	0	(1.2)
Losses on derivative instruments		0.6	0.5	1.1	1
Amortization of defined benefit pension and postretirement plans items		1.8	0	3.5	2.7
Tax effect		(0.6)	0.1	(1.2)	(1)
Reclassifications from accumulated other comprehensive loss to earnings, net of tax		$ 2.5	$ 6.9	$ 3.7	$ 8
[1]	These foreign currency translation adjustments are primarily a result of the sales of businesses

Employee Benefits (Details)

Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Foreign Plan [Member]
Defined Pension and Postretirement Benefit Plans
Service cost	$ 1	$ 2.2	$ 1.9	$ 4.9
Interest cost	3.3	4.7	6.6	9.2
Expected return on plan assets	(4.4)	(5.3)	(8.7)	(10.6)
Settlements and curtailments	0	0.2	0	0.2
Amortization of:
Prior service cost	0	0	0	0
Unrecognized actuarial losses	1.4	0.9	2.7	1.8
Net periodic cost	1.3	2.7	2.5	5.5
Pension plan - employer contributions			8.6
Pension plan - estimated employer contributions for remainder of current fiscal year	9		9
Domestic Plan [Member]
Defined Pension and Postretirement Benefit Plans
Service cost	0	0	0	0
Interest cost	1.2	1.5	2.5	3
Expected return on plan assets	(1.5)	(1.7)	(3.1)	(3.4)
Settlements and curtailments	0	0	0	0
Amortization of:
Prior service cost	0	0	0	0
Unrecognized actuarial losses	0.4	(1.2)	0.8	0.7
Net periodic cost	0.1	(1.4)	0.2	0.3
Pension plan - employer contributions			0.3
Pension plan - estimated employer contributions for remainder of current fiscal year	2		2
Domestic Postretirement Benefit Plan
Defined Pension and Postretirement Benefit Plans
Service cost	0	0	0	0
Interest cost	0.3	0.3	0.6	0.7
Expected return on plan assets	0	0	0	0
Settlements and curtailments	0	0	0	0
Amortization of:
Prior service cost	0	0.1	0	0
Unrecognized actuarial losses	0	0	0	0
Net periodic cost	$ 0.3	$ 0.4	$ 0.6	$ 0.7

Segment Information Operations

Segment Information Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segments:
Revenue	$ 1,884.9	$ 1,917.9	$ 3,638.8	$ 3,659.9
Segment operating income (loss):	206.5	224.3	236.2	247.3
Interest expense	(25.7)	(24.5)	(46.6)	(47.1)
Interest income	4.7	5.6	9.9	11.4
Other (expense) income, net	(15.4)	0.4	(14.6)	(18.8)
Income before income taxes	170.1	205.8	184.9	192.8
Depreciation and amortization of fixed assets and intangible assets	41.3	39.8	82.3	77.8
Capital expenditures	44.1	36	68.9	63
IAN
Segments:
Revenue	1,537.8	1,548.5	2,945.4	2,950.1
Segment operating income (loss):	174.4	198.2	218.2	240
Depreciation and amortization of fixed assets and intangible assets	30.6	29.2	60.1	56.8
Capital expenditures	31.4	26.9	48.6	47.2
CMG
Segments:
Revenue	347.1	369.4	693.4	709.8
Segment operating income (loss):	53.9	50	77.3	70.4
Depreciation and amortization of fixed assets and intangible assets	5.3	4.9	10.6	9.7
Capital expenditures	4	2.2	6.7	3.7
Corporate and Other
Segments:
Segment operating income (loss):	(21.8)	(23.9)	(59.3)	(63.1)
Depreciation and amortization of fixed assets and intangible assets	5.4	5.7	11.6	11.3
Capital expenditures	$ 8.7	$ 6.9	$ 13.6	$ 12.1

Segment Information Balance She

Segment Information Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Segments:
Assets	$ 11,678.2	$ 12,485.2
IAN
Segments:
Assets	10,282.4	10,660
CMG
Segments:
Assets	1,402.3	1,428.3
Corporate and Other
Segments:
Assets	$ (6.5)	$ 396.9

Fair Value on a Recurring Basis

Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Level 1
Fair value assets and liabilities measured on recurring basis
Cash equivalents		$ 176.7	$ 440.8
Short-term marketable securities		3.2	3
Long-term investments		0.4	0.4
Fair Value of Total Assets, Recurring		$ 180.3	$ 444.2
Fair value of assets measured on a recurring basis percentage of total assets		1.50%	3.60%
Contingent acquisition obligations	[1]	$ 0	$ 0
Level 2
Fair value assets and liabilities measured on recurring basis
Cash equivalents		0	0
Short-term marketable securities		0	0
Long-term investments		0	0
Fair Value of Total Assets, Recurring		$ 0	$ 0
Fair value of assets measured on a recurring basis percentage of total assets		0.00%	0.00%
Contingent acquisition obligations	[1]	$ 0	$ 0
Level 3
Fair value assets and liabilities measured on recurring basis
Cash equivalents		0	0
Short-term marketable securities		0	0
Long-term investments		0	0
Fair Value of Total Assets, Recurring		$ 0	$ 0
Fair value of assets measured on a recurring basis percentage of total assets		0.00%	0.00%
Contingent acquisition obligations	[1]	$ 157	$ 205.4
Fair Value, Total [Member]
Fair value assets and liabilities measured on recurring basis
Cash equivalents		176.7	440.8
Short-term marketable securities		3.2	3
Long-term investments		0.4	0.4
Fair Value of Total Assets, Recurring		$ 180.3	$ 444.2
Fair value of assets measured on a recurring basis percentage of total assets		1.50%	3.60%
Contingent acquisition obligations	[1]	$ 157	$ 205.4
[1]	Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The decrease in this balance of $48.4 from December 31, 2016 to June 30, 2017 is primarily due to payments of $75.2, partially offset by acquisitions and exercised options of $16.3. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Level 1
Fair value assets and liabilities measured on nonrecurring basis
Total long-term debt	$ 0	$ 0
Level 2
Fair value assets and liabilities measured on nonrecurring basis
Total long-term debt	1,607.1	1,574.7
Level 3
Fair value assets and liabilities measured on nonrecurring basis
Total long-term debt	44.4	65.4
Fair Value, Total [Member]
Fair value assets and liabilities measured on nonrecurring basis
Total long-term debt	$ 1,651.5	$ 1,640.1

Commitments and Contingencies50

Commitments and Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Lease guarantees	$ 824.1	$ 857.3
Credit facility guarantees	$ 399.8	$ 395.6

Recent Accounting Standards Rec

Recent Accounting Standards Recent Accounting Standards (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Postretirement costs/(benefits)	$ 0.8	$ (0.5)	$ 1.6
Restricted cash	$ 2.3	$ 3.1	$ 2.3	$ 2.5	$ 3.2