The Interpublic Group of Companies, Inc. (IPG) 10-Q 26 Oct 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 15, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	1-6686
Entity Registrant Name	INTERPUBLIC GROUP OF COMPANIES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-1024020
Entity Address, Address Description	909 Third Avenue,
Entity Address, City or Town	New York,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10022
Area Code	(212)
Local Phone Number	704-1200
Title of each class	Common Stock, par value $0.10 per share
Trading Symbol	IPG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000051644
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		393,755,260

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
REVENUE:
Net revenue	$ 2,261.7	$ 1,954.6	$ 6,559	$ 5,780.1
Billable expenses	280.3	170.9	749.6	730.9
Total revenue	2,542	2,125.5	7,308.6	6,511
OPERATING EXPENSES:
Salaries and related expenses	1,511.2	1,269.9	4,389.2	3,998.8
Office and other direct expenses	300.9	307.9	894.8	1,003.1
Billable expenses	280.3	170.9	749.6	730.9
Cost of services	2,092.4	1,748.7	6,033.6	5,732.8
Selling, general and administrative expenses	32.2	9.9	89.8	36.4
Depreciation and amortization	69.4	71	208.7	216.9
Restructuring charges	(3.5)	47.3	(2.4)	159.9
Total operating expenses	2,190.5	1,876.9	6,329.7	6,146
OPERATING INCOME	351.5	248.6	978.9	365
EXPENSES AND OTHER INCOME:
Interest expense	(42.9)	(50.8)	(135.1)	(145.4)
Interest income	7.4	6.1	21.9	22.7
Other Nonoperating Income (Expense)	2.3	(11.3)	(76.9)	(54.6)
Total (expenses) and other income	(33.2)	(56)	(190.1)	(177.3)
Income before income taxes	318.3	192.6	788.8	187.7
Provision for (benefit of) income taxes	73.9	(86.3)	184.4	(50.1)
Income of consolidated companies	244.4	278.9	604.4	237.8
Equity in net income (loss) of unconsolidated affiliates	0.2	(0.4)	0.4	(0.6)
NET INCOME	244.6	278.5	604.8	237.2
Net (income) loss attributable to noncontrolling interests	(4.7)	1.2	(9.9)	1.6
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS	$ 239.9	$ 279.7	$ 594.9	$ 238.8
Earnings per share, Basic	$ 0.61	$ 0.72	$ 1.51	$ 0.61
Earnings per share, Diluted	$ 0.60	$ 0.71	$ 1.49	$ 0.61
Weighted-average number of common shares outstanding, Basic	393.5	389.6	392.8	388.9
Weighted-average number of common shares outstanding, Diluted	399.8	393.9	398.3	392.6

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 244.6	$ 278.5	$ 604.8	$ 237.2
Foreign currency translation:
Foreign currency translation adjustments	(51.2)	46.5	(75.6)	(58.3)
Reclassification adjustments recognized in net income	0.5	9.6	(1)	9.3
Foreign currency transaction and translation adjustment, net of tax	(50.7)	56.1	(76.6)	(49)
Derivative Instrument:
Changes in fair value of derivative instruments	0.9	4.5	15.8	3.6
Recognition of previously unrealized (gain) losses in net income	(0.3)	0.6	4.6	1.8
Income tax effect	0.1	(1.3)	(2.5)	(1.4)
Net unrecognized gains on derivative instruments, net of tax	0.7	3.8	17.9	4
Defined benefit pension and other postretirement plans:
Net actuarial gains for the period	5.4	0	4.2	2.2
Amortization of unrecognized losses, transition obligation and prior service cost included in net income	2.4	1.8	7.2	5.5
Settlement losses included in net income	1.2	0	1.2	0
Other	0.1	0.4	0.1	(1)
Income tax effect	(2.1)	(0.4)	(3.1)	(1.6)
Defined benefit pension and other postretirement plans adjustment, net of tax	7	1.8	9.6	5.1
Other comprehensive (loss) income, net of tax	(43)	61.7	(49.1)	(39.9)
TOTAL COMPREHENSIVE INCOME	201.6	340.2	555.7	197.3
Less: comprehensive income (loss) attributable to noncontrolling interests	3.8	(0.8)	9	(3.7)
COMPREHENSIVE INCOME ATTRIBUTABLE TO IPG	$ 197.8	$ 341	$ 546.7	$ 201

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
ASSETS:
Cash and cash equivalents	$ 2,490	$ 2,509
Accounts receivable, net of allowance of $84.6 and $98.3, respectively	4,042.5	4,646.4
Accounts receivable, billable to clients	2,150.4	1,820.7
Assets held for sale	3.5	0.8
Other current assets	446.5	390.7
Total current assets	9,132.9	9,367.6
Property and equipment, net of accumulated depreciation and amortization of $1,196.4 and $1,133.9, respectively	666.3	690.3
Deferred Income Tax Assets, Net	273.7	302
Goodwill	4,914.4	4,945.5
Other intangible assets	869.7	933.6
Operating lease right-of-use asset	1,516.5	1,379.3
Other non-current assets	431.8	424.4
TOTAL ASSETS	17,805.3	18,042.7
LIABILITIES:
Accounts payable	6,844.2	7,269.7
Accrued liabilities	760.4	832.4
Contract liabilities	622.2	657.8
Short-term borrowings	44.1	48
Current portion of long-term debt	500.4	502.5
Current portion of operating leases	270.1	268.5
Liabilities held for sale	7.6	1.6
Total current liabilities	9,049	9,580.5
Long-term debt	2,908.3	2,915.8
Non-current operating leases	1,536.1	1,441
Deferred compensation	378.9	413.2
Other non-current liabilities	639.1	655.2
TOTAL LIABILITIES	14,511.4	15,005.7
Redeemable noncontrolling interests	72.6	93.1
STOCKHOLDERS' EQUITY:
Common stock	39.3	39
Additional paid-in capital	1,151.6	1,099.3
Retained earnings	2,908.9	2,636.9
Accumulated other comprehensive loss, net of tax	(928.4)	(880.2)
Total IPG stockholders' equity	3,171.4	2,895
Noncontrolling interests	49.9	48.9
TOTAL STOCKHOLDERS' EQUITY	3,221.3	2,943.9
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	17,805.3	18,042.7
Parentheticals:
Allowance for doubtful accounts receivable	84.6	98.3
Accumulated depreciation, property and equipment	$ 1,196.4	$ 1,133.9

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 604,800,000	$ 237,200,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	208,700,000	216,900,000
Loss on Extinguishment of Debt	74,000,000	0
Amortization of restricted stock and other non-cash compensation	57,900,000	56,400,000
Deferred income tax	34,600,000	(9,400,000)
Net losses on sales of businesses	18,600,000	51,800,000
Net amortization of bond discounts and deferred financing costs	4,800,000	8,600,000
(Reversal of) Provision for uncollectible receivables	(6,300,000)	49,800,000
Non-cash restructuring charges	(2,200,000)	95,700,000
Other	4,100,000	20,700,000
Changes in assets and liabilities, net of acquisitions and divestitures, providing (using) cash:
Accounts receivable	511,500,000	1,759,900,000
Accounts receivable, billable to clients	367,300,000	(83,000,000)
Other current assets	(66,300,000)	(60,700,000)
Accounts payable	(302,100,000)	(2,014,700,000)
Accrued liabilities	(65,200,000)	(61,300,000)
Contract liabilities	(26,300,000)	34,100,000
Other non-current assets and liabilities	(74,700,000)	(142,900,000)
Net cash provided by operating activities	608,600,000	325,100,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(123,400,000)	(112,000,000)
Deconsolidation of a subsidiary	16,300,000	0
Acquisitions, net of cash acquired	0	(2,500,000)
Net proceeds from investments	(32,700,000)	(5,600,000)
Other investing activities	(8,100,000)	(23,600,000)
Net cash used in investing activities	(115,100,000)	(132,500,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Early extinguishment of long-term debt	(1,066,800,000)	0
Common stock dividends	(321,400,000)	(298,600,000)
Acquisition-related payments	(28,000,000)	(40,600,000)
Tax payments for employee shares withheld	(25,000,000)	(22,200,000)
Net increase in short-term borrowings	(9,400,000)	1,900,000
Distributions to noncontrolling interests	(9,000,000)	(13,700,000)
Proceeds from Issuance of Long-term Debt	998,100,000	646,200,000
Exercise of stock options	8,000,000	0
Other financing activities	(14,300,000)	(10,700,000)
Net cash (used in) provided by financing activities	(467,800,000)	262,300,000
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	(40,300,000)	(20,300,000)
Net (decrease) increase in cash, cash equivalents and restricted cash	(14,600,000)	434,600,000
Cash, cash equivalents, and restricted cash at beginning of period	2,511,500,000	1,195,700,000
Cash, cash equivalents, and restricted cash at end of period	$ 2,496,900,000	$ 1,630,300,000

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	Total IPG Stockholders' Equity	Noncontrolling Interests
Common Stock, shares		387
Changes related to lease standard update	$ (6.6)				$ (6.6)		$ (6.6)
Balance at Dec. 31, 2019	2,825.6		$ 38.7	$ 977.3	2,689.9	$ (930)	2,775.9	$ 49.7
Net income	237.2
Net income available to IPG common stockholders	238.8				238.8		238.8
Net (income) loss attributable to noncontrolling interest	(1.6)							(1.6)
Other comprehensive income (loss)	(39.9)					(37.8)	(37.8)
Other comprehensive loss, attributable to noncontrolling interest								(2.1)
Reclassifications related to redeemable noncontrolling interests	(5.9)							(5.9)
Distributions to noncontrolling interests	(13.7)							13.7
Change in redemption value of redeemable noncontrolling interests	3.1				3.1		3.1
Common stock dividends	(301.8)				(301.8)		(301.8)
Stock-based compensation, shares		3.8
Stock-based compensation, value	64.1		0.4	63.7			64.1
Exercise of stock options, shares		0
Exercise of stock options, value	0.5		0	0.5			0.5
Shares withheld for taxes, shares		(1.1)
Shares withheld for taxes, value	(22.4)		0.2	22.2			22.4
Other	(8.6)			(8.8)			8.8	0.2
Balance at Sep. 30, 2020	2,760.6		38.9	1,028.1	2,623.4	(967.8)	2,722.6	38
Common Stock, shares		389.6
Balance at Jun. 30, 2020	2,491.1		38.9	996.3	2,444.3	(1,029.1)	2,450.4	40.7
Net income	278.5
Net income available to IPG common stockholders	279.7				279.7		279.7
Net (income) loss attributable to noncontrolling interest	(1.2)							(1.2)
Other comprehensive income (loss)	61.7					61.3	61.3
Other comprehensive loss, attributable to noncontrolling interest								0.4
Reclassifications related to redeemable noncontrolling interests	(2.9)							(2.9)
Distributions to noncontrolling interests	(4.3)							4.3
Common stock dividends	(100.6)				(100.6)		(100.6)
Stock-based compensation, shares		0.2
Stock-based compensation, value	23.1		0	23.1			23.1
Exercise of stock options, shares		0
Exercise of stock options, value	0.1		0	0.1			0.1
Shares withheld for taxes, shares		(0.1)
Shares withheld for taxes, value	(0.2)		0	0.2			0.2
Other	8.3			(8.8)			8.8	(0.5)
Balance at Sep. 30, 2020	2,760.6		38.9	1,028.1	2,623.4	(967.8)	2,722.6	38
Common Stock, shares		389.7
Common Stock, shares		390.9
Balance at Dec. 31, 2020	2,943.9		39	1,099.3	2,636.9	(880.2)	2,895	48.9
Net income	604.8
Net income available to IPG common stockholders	594.9				594.9		594.9
Net (income) loss attributable to noncontrolling interest	9.9							9.9
Other comprehensive income (loss)	(49.1)					(48.2)	(48.2)
Other comprehensive loss, attributable to noncontrolling interest								(0.9)
Reclassifications related to redeemable noncontrolling interests	(0.1)							(0.1)
Distributions to noncontrolling interests	(9)							9
Change in redemption value of redeemable noncontrolling interests	(2.1)				(2.1)		(2.1)
Common stock dividends	(320.8)				(320.8)		(320.8)
Stock-based compensation, shares		3
Stock-based compensation, value	69.2		0.3	68.9			69.2
Exercise of stock options, shares		0.6
Exercise of stock options, value	8.6		0.1	8.5			8.6
Shares withheld for taxes, shares		(0.9)
Shares withheld for taxes, value	(25.2)		0.1	25.1			25.2
Other	(0.9)							(0.9)
Balance at Sep. 30, 2021	3,221.3		39.3	1,151.6	2,908.9	(928.4)	3,171.4	49.9
Common Stock, shares		393.5
Balance at Jun. 30, 2021	3,111.3		39.3	1,132.4	2,777.5	(886.3)	3,062.9	48.4
Net income	244.6
Net income available to IPG common stockholders	239.9				239.9		239.9
Net (income) loss attributable to noncontrolling interest	4.7							4.7
Other comprehensive income (loss)	(43)					(42.1)	(42.1)
Other comprehensive loss, attributable to noncontrolling interest								(0.9)
Reclassifications related to redeemable noncontrolling interests	0.5							0.5
Distributions to noncontrolling interests	(2.2)							2.2
Change in redemption value of redeemable noncontrolling interests	(1.4)				(1.4)		(1.4)
Common stock dividends	(107.1)				(107.1)		(107.1)
Stock-based compensation, shares		0.1
Stock-based compensation, value	19.8		0	19.8			19.8
Exercise of stock options, shares		0
Exercise of stock options, value	0.2		0	0.2			0.2
Shares withheld for taxes, shares		0
Shares withheld for taxes, value	(0.8)		0	0.8			0.8
Other	(0.4)							(0.4)
Balance at Sep. 30, 2021	$ 3,221.3		$ 39.3	$ 1,151.6	$ 2,908.9	$ (928.4)	$ 3,171.4	$ 49.9
Common Stock, shares		393.6

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
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 effects of the coronavirus ("COVID-19") pandemic have impacted and will likely continue to impact our results of operations, cash flows and financial position. The Company’s Consolidated Financial Statements presented herein reflect the latest estimates and assumptions made by management that affect the reported amounts of assets and liabilities and related disclosures as of the date of the consolidated financial statements and reported amounts of revenue and expenses during the reporting periods presented. The Company believes it has used reasonable estimates and assumptions to assess the fair values of goodwill, long-lived assets and indefinite-lived intangible assets; assessment of the annual effective tax rate; valuation of deferred income taxes and allowance for expected credit losses on future uncollectible accounts receivable. 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 Annual Report on Form 10-K for the year ended December 31, 2020 (the “2020 Annual Report”). Cost of services is comprised of the expenses of our revenue-producing reportable segments, Integrated Agency Networks (“IAN”) and IPG DXTRA (“DXTRA”), including salaries and related expenses, office and other direct expenses and billable expenses, and includes an allocation of the centrally managed expenses from our "Corporate and Other" group. Office and other direct expenses include rent expense, professional fees, certain expenses incurred by our staff in servicing our clients and other costs directly attributable to client engagements. Selling, general and administrative expenses are primarily the unallocated expenses from Corporate and Other, excluding depreciation and amortization. Depreciation and amortization of fixed assets and intangible assets of the Company is disclosed as a separate operating expense. Restructuring charges in 2021 consist of adjustments to the Company's restructuring actions taken during 2020 to lower our operating expenses structurally and permanently relative to revenue and to accelerate the transformation of our business, as discussed further in Note 7. Restructuring charges mainly include severance and termination costs and lease impairment costs. 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 changes have been made to prior-period financial statements to conform to the current-period presentation.

Revenue (Notes)

Revenue (Notes)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Disaggregation of Revenue We have two reportable segments as of September 30, 2021: IAN and DXTRA, as further discussed in Note 11. IAN principally generates revenue from providing advertising and media services as well as a comprehensive array of global communications, marketing services and data management. DXTRA generates revenue from a comprehensive array of global public relations and communication services as well as providing events, sports and entertainment marketing, corporate and brand identity, and strategic marketing consulting. Our agencies are located in over 100 countries, including every significant world market. Our geographic revenue breakdown is listed below. Three months ended Nine months ended Total revenue: 2021 2020 2021 2020 United States $ 1,612.1 $ 1,354.8 $ 4,595.8 $ 4,234.0 International: United Kingdom 224.3 172.4 637.4 528.8 Continental Europe 200.2 174.5 625.6 508.5 Asia Pacific 229.0 198.1 673.1 609.9 Latin America 104.3 83.2 290.1 235.7 Other 172.1 142.5 486.6 394.1 Total International 929.9 770.7 2,712.8 2,277.0 Total Consolidated $ 2,542.0 $ 2,125.5 $ 7,308.6 $ 6,511.0 Three months ended Nine months ended Net revenue: 2021 2020 2021 2020 United States $ 1,459.3 $ 1,273.4 $ 4,204.6 $ 3,820.6 International: United Kingdom 195.1 162.0 573.7 474.9 Continental Europe 178.1 158.0 559.4 453.7 Asia Pacific 192.0 166.0 553.6 487.4 Latin America 96.3 78.5 268.6 220.1 Other 140.9 116.7 399.1 323.4 Total International 802.4 681.2 2,354.4 1,959.5 Total Consolidated $ 2,261.7 $ 1,954.6 $ 6,559.0 $ 5,780.1 IAN Three months ended Nine months ended Total revenue: 2021 2020 2021 2020 United States $ 1,306.2 $ 1,130.5 $ 3,731.4 $ 3,402.7 International 779.5 653.1 2,283.5 1,872.2 Total IAN $ 2,085.7 $ 1,783.6 $ 6,014.9 $ 5,274.9 Net revenue: United States $ 1,242.3 $ 1,093.8 $ 3,581.1 $ 3,254.1 International 700.4 591.7 2,050.2 1,681.6 Total IAN $ 1,942.7 $ 1,685.5 $ 5,631.3 $ 4,935.7 DXTRA Three months ended Nine months ended Total revenue: 2021 2020 2021 2020 United States $ 305.9 $ 224.3 $ 864.4 $ 831.3 International 150.4 117.6 429.3 404.8 Total DXTRA $ 456.3 $ 341.9 $ 1,293.7 $ 1,236.1 Net revenue: United States $ 217.0 $ 179.6 $ 623.5 $ 566.5 International 102.0 89.5 304.2 277.9 Total DXTRA $ 319.0 $ 269.1 $ 927.7 $ 844.4 Contract Balances The following table provides information about receivables, contract assets and contract liabilities from contracts with customers. September 30, December 31, Accounts receivable, net of allowance of $84.6 and $98.3, respectively $ 4,042.5 $ 4,646.4 Accounts receivable, billable to clients 2,150.4 1,820.7 Contract assets 50.2 51.8 Contract liabilities (deferred revenue) 622.2 657.8 Contract assets are primarily comprised of contract incentives that are generally satisfied annually under the terms of our contracts and are transferred to accounts receivable when the right to payment becomes unconditional. Contract liabilities relate to advance consideration received from customers under the terms of our contracts primarily related to reimbursements of third-party expenses, whether we act as principal or agent, and to a lesser extent, periodic retainer fees, both of which are generally recognized shortly after billing. The majority of our contracts are for periods of one year or less with the exception of our data management contracts. For those contracts with a term of more than one year, we had approximately $604.4 of unsatisfied performance obligations as of September 30, 2021, which will be recognized as services are performed over the remaining contractual terms through 2027.

Debt and Credit Arrangements (N

Debt and Credit Arrangements (Notes)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt and Credit Arrangements	Debt and Credit Arrangements Long-Term Debt A summary of the carrying amounts of our long-term debt is listed below. Effective September 30, December 31, 3.750% Senior Notes due 2021 3.980% $ 500.0 $ 499.1 4.000% Senior Notes due 2022 4.130% — 249.3 3.750% Senior Notes due 2023 4.320% — 498.8 4.200% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.2 and $0.5, respectively) 4.240% 249.3 498.3 4.650% Senior Notes due 2028 (less unamortized discount and issuance costs of $1.3 and $3.1, respectively) 4.780% 495.6 495.2 4.750% Senior Notes due 2030 (less unamortized discount and issuance costs of $3.4 and $5.2, respectively) 4.920% 641.4 640.8 2.400% Senior Notes due 2031 (less unamortized discount and issuance costs of $0.8 and $4.4, respectively) 2.512% 494.8 — 3.375% Senior Notes due 2041 (less unamortized discount and issuance costs of $1.1 and $5.6, respectively) 3.448% 493.3 — 5.400% Senior Notes due 2048 (less unamortized discount and issuance costs of $2.7 and $5.0, respectively) 5.480% 492.3 492.1 Other notes payable and capitalized leases 42.0 44.7 Total long-term debt 3,408.7 3,418.3 Less: current portion 500.4 502.5 Long-term debt, excluding current portion $ 2,908.3 $ 2,915.8 As of September 30, 2021 and December 31, 2020, the estimated fair value of the Company's long-term debt was $3,875.3 and $3,995.0, respectively. Refer to Note 12 for details. Debt Transactions 3.750% Senior Notes due 2021 Our 3.750% unsecured senior notes in aggregate principal amount of $500.0 matured on October 1, 2021, and we used cash on hand to fund the principal repayment. 2.400% Senior Notes due 2031 On February 25, 2021, we issued a total of $500.0 in aggregate principal amount of 2.400% unsecured senior notes (the “2.400% Senior Notes”) due March 1, 2031. Upon issuance, the 2.400% Senior Notes were reflected in our unaudited Consolidated Balance Sheets at $494.5, net of discount of $0.8 and net of capitalized debt issuance costs, including commissions and offering expenses of $4.7, both of which will be amortized in interest expense through the maturity date using the effective interest method. Interest is payable semi-annually in arrears on March 1st and September 1st of each year, commencing on September 1, 2021. 3.375% Senior Notes due 2041 On February 25, 2021, we issued a total of $500.0 in aggregate principal amount of 3.375% unsecured senior notes (the “3.375% Senior Notes”) due March 1, 2041. Upon issuance, the 3.375% Senior Notes were reflected in our unaudited Consolidated Balance Sheets at $493.1, net of discount of $1.1 and net of capitalized debt issuance costs, including commissions and offering expenses of $5.8, both of which will be amortized in interest expense through the maturity date using the effective interest method. Interest is payable semi-annually in arrears on March 1st and September 1st of each year, commencing on September 1, 2021. Consistent with our other outstanding debt securities, the newly issued 2.400% Senior Notes and 3.375% Senior Notes include covenants that, among other things, limit our liens and the liens of certain of our consolidated subsidiaries, but do not require us to maintain any financial ratios or specified levels of net worth or liquidity. We may redeem the 2.400% Senior Notes and 3.375% Senior Notes at any time in whole, or from time to time in part, in accordance with the provisions of the indenture, including the applicable supplemental indentures, which contain make-whole provisions, under which the 2.400% Senior Notes and 3.375% Senior Notes were issued. Additionally, upon the occurrence of a change of control repurchase event with respect to the 2.400% Senior Notes and 3.375% Senior Notes, each holder of the 2.400% Senior Notes and 3.375% Senior Notes has the right to require the Company to purchase that holder’s 2.400% Senior Notes and 3.375% Senior Notes at a price equal to 101% of the principal amount thereof, plus accrued and unpaid interest, unless the Company has exercised its option to redeem all the 2.400% Senior Notes and 3.375% Senior Notes. The proceeds of the 2.400%Senior Notes and 3.375% Senior Notes were used in funding the early extinguishment of certain of our senior notes. 4.000% Senior Notes due 2022 In March 2021, we redeemed all $250.0 in aggregate principal amount of the 4.000% unsecured senior notes due 2022 (the "4.000% Senior Notes"). Total cash paid to redeem the 4.000% Senior Notes was $258.9. In connection with the redemption of the 4.000% Senior Notes, we recognized a loss on early extinguishment of debt of $9.2, which included a redemption premium of $8.6 and the write-off of the remaining unamortized discount and debt issuance costs of $0.6. The loss on early extinguishment of debt was recorded in Other income (expense), net, within our unaudited Consolidated Statement of Operations. 3.750% Senior Notes due 2023 In March 2021, we redeemed all $500.0 in aggregate principal amount of the 3.750% unsecured senior notes due 2023 (the "3.750% Senior Notes"). Total cash paid to redeem the 3.750% Senior Notes was $532.9. In connection with the redemption of the 3.750% Senior Notes, we recognized a loss on early extinguishment of debt of $36.5, which included a redemption premium of $30.7, the write-off of the remaining unamortized discount and debt issuance costs of $1.1 and a related deferred loss in other comprehensive income of $4.7. The loss on early extinguishment of debt was recorded in Other income (expense), net, within our unaudited Consolidated Statement of Operations. 4.200% Senior Notes due 2024 In March 2021, we redeemed $250.0 of the $500.0 in aggregate principal amount of the 4.200% unsecured senior notes due 2024 (the "4.200% Senior Notes"). Total cash paid to redeem the 4.200% Senior Notes was $282.2. In connection with the redemption of the 4.200% Senior Notes, we recognized a loss on early extinguishment of debt of $28.3, which included a redemption premium of $27.5, and the write-off of half of the remaining unamortized discount and unamortized debt issuance costs of $0.8. The loss on early extinguishment of debt was recorded in Other income (expense), net, within our unaudited Consolidated Statement of Operations. Credit Arrangements Credit Agreement We maintain a committed corporate credit facility, originally dated as of July 18, 2008, 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 November 2024, 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 $1,500.0, 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 of $50.0, or the equivalent in other currencies. Our obligations under the Credit Agreement are unsecured. The Credit Agreement includes covenants that, among other things, (i) limit our liens and the liens of our consolidated subsidiaries, and (ii) limit subsidiary debt. The Credit Agreement also contains a financial covenant that requires us to maintain a certain leverage ratio on a consolidated basis as of the end of each fiscal quarter. As of September 30, 2021, there were no borrowings under the Credit Agreement; however, we had $10.7 of letters of credit under the Credit Agreement, which reduced our total availability to $1,489.3. We were in compliance with all of our covenants in the Credit Agreement as of September 30, 2021. 364-Day Credit Facility On March 27, 2020, we entered into an agreement for a 364-day revolving credit facility (the "364-Day Credit Facility") that matured on March 26, 2021. The 364-Day Credit Facility was a revolving facility, under which amounts borrowed by us were to be repaid and reborrowed, subject to an aggregate lending limit of $500.0. The cost structure of the 364-Day Credit Agreement was based on the Company’s credit ratings. The applicable margin for Base Rate Advances (as defined in the 364-Day Credit Facility) was 0.250%, the applicable margin for Eurodollar Rate Advances (as defined in the 364-Day Credit Facility) was 1.250%, and the facility fee payable on a lender’s revolving commitment was 0.250%. The leverage ratio and other covenants set forth in the 364-Day Credit Facility were equivalent to the covenants contained in the Company’s existing Credit Agreement, which remains in full effect. Uncommitted Lines of Credit We also have uncommitted lines of credit with various banks that permit borrowings at variable interest rates and that 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 operations. As of September 30, 2021, the Company had uncommitted lines of credit in an aggregate amount of $951.4, under which we had outstanding borrowings of $44.1 classified as short-term borrowings on our Consolidated Balance Sheet. The average amount outstanding during the third quarter of 2021 was $72.2 with a weighted-average interest rate of approximately 2.8%. Commercial Paper The Company is authorized to issue unsecured commercial paper up to a maximum aggregate amount outstanding at any time of $1,500.0. Borrowings under the program are supported by the Credit Agreement described above. Proceeds of the commercial paper are 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. During the third quarter of 2021, there was no commercial paper activity and, as of September 30, 2021, there was no commercial paper outstanding.

Earnings Per Share (Notes)

Earnings Per Share (Notes)	9 Months Ended
	Sep. 30, 2021
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 September 30, Nine Months Ended 2021 2020 2021 2020 Net income available to IPG common stockholders $ 239.9 $ 279.7 $ 594.9 $ 238.8 Weighted-average number of common shares outstanding - basic 393.5 389.6 392.8 388.9 Dilutive effect of stock options and restricted shares 6.3 4.3 5.5 3.7 Weighted-average number of common shares outstanding - diluted 399.8 393.9 398.3 392.6 Earnings per share available to IPG common stockholders: Basic $ 0.61 $ 0.72 $ 1.51 $ 0.61 Diluted $ 0.60 $ 0.71 $ 1.49 $ 0.61

Supplementary Data (Notes)

Supplementary Data (Notes)	9 Months Ended
	Sep. 30, 2021
Supplementary Data [Abstract]
Accrued Liabilities	Accrued Liabilities The following table presents the components of accrued liabilities. September 30, December 31, Salaries, benefits and related expenses $ 569.2 $ 504.6 Interest 44.0 43.6 Office and related expenses 20.4 25.5 Acquisition obligations 15.7 47.9 Restructuring charges 11.5 69.5 Income taxes payable 4.1 50.6 Other 95.5 90.7 Total accrued liabilities $ 760.4 $ 832.4
Other Income, Net	Other Income (Expense), Net Results of operations for the three and nine months ended September 30, 2021 and 2020 include certain items that are not directly associated with our revenue-producing operations. Three months ended Nine months ended 2021 2020 2021 2020 Loss on early extinguishment of debt $ — $ — $ (74.0) $ — Net losses on sales of businesses (4.4) (8.6) (18.6) (51.8) Other 6.7 (2.7) 15.7 (2.8) Total other income (expense), net $ 2.3 $ (11.3) $ (76.9) $ (54.6) Loss on early extinguishment of debt – During the first quarter of 2021, we recorded a loss of $74.0 related to the early extinguishment of all $250.0 in aggregate principal amount of our 4.000% unsecured senior notes due 2022, all $500.0 in aggregate principal amount of our 3.750% Senior Notes due 2023, and $250.0 of the $500.0 in aggregate principal amount of our 4.200% Senior Notes due 2024. See Note 3 for further information. Net losses on sales of businesses – During the three and nine months ended September 30, 2021 and 2020, the amounts recognized were related to sales of businesses and the classification of certain assets and liabilities, consisting primarily of cash, as held for sale, within our IAN and DXTRA reportable segments. The businesses held for sale primarily represent unprofitable, non-strategic agencies which are expected to be sold within the next twelve months. Other - During the three and nine months ended September 30, 2021, the amounts recognized were primarily related to a non-cash gain related to the deconsolidation of a previously consolidated entity in which we maintain an equity interest.
Share Repurchase Program	Share Repurchase Program On July 2, 2018, in connection with the announcement of the Acxiom acquisition, we announced that share repurchases will be suspended for a period of time in order to reduce the increased debt levels incurred in conjunction with the acquisition. As of September 30, 2021, $338.4 ,
Redeemable Noncontrolling Interest [Table Text Block]	Redeemable Non-controlling Interests Many of our acquisitions include provisions under which the non-controlling equity owners may require us to purchase additional interests in a subsidiary at their discretion. Redeemable non-controlling interests are adjusted quarterly, if necessary, to their estimated redemption value, but not less than their initial fair value. Any adjustments to the redemption value impact retained earnings or additional paid in capital, except for foreign currency translation adjustments. The following table presents changes in our redeemable non-controlling interests. Nine months ended 2021 2020 Balance at beginning of period $ 93.1 $ 164.7 Change in related non-controlling interests balance 1.1 (6.0) Changes in redemption value of redeemable non-controlling interests: Redemptions (22.7) (2.5) Redemption value adjustments 1.1 (3.4) Balance at end of period $ 72.6 $ 152.8

Income Taxes (Notes)

Income Taxes (Notes)	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three and nine months ended September 30, 2021, our income tax expense was positively impacted by excess tax benefits on employee share-based payments, the majority of which were recognized in the first quarter due to the timing of the vesting of awards, and the revaluation of deferred tax balances resulting from the enactment of tax law changes. This was partially offset by net losses on sales of businesses and the classification of certain assets as held for sale for which we received minimal tax benefit, as well as 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, 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 $20.0 and $30.0 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 2016. With limited exceptions, we are no longer subject to state and local income tax audits for years prior to 2013 or non-U.S. income tax audits for years prior to 2009.

Restructuring Charges (Notes)

Restructuring Charges (Notes)	9 Months Ended
	Sep. 30, 2021
Restructuring Charges [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	Restructuring Charges Beginning in the second quarter of 2020, the Company took restructuring actions to lower its operating expenses structurally and permanently relative to revenue and to accelerate the transformation of our business (the “2020 Restructuring Plan”). These actions continued through the fourth quarter, and most were based on our recent experience and learning in the COVID-19 pandemic and a resulting review of our operations to address certain operating expenses such as occupancy expense and salaries and related expenses. Lease impairment costs, which relate to the office spaces that were vacated as part of the 2020 Restructuring Plan, included impairments of operating lease right-of-use assets and associated leasehold improvements, furniture and asset retirement obligations in addition to losses and gains related to early lease terminations. Lease impairments were calculated based on estimated fair values using market participant assumptions including forecasted net discounted cash flows related to the operating lease right-of-use assets. All restructuring actions were identified and initiated in 2020, with all actions completed by the end of the fourth quarter of 2020. The amounts for the three and nine months ended September 30, 2021 are adjustments to the actions taken in 2020. The components of the restructuring charges related to the 2020 Restructuring Plan are listed below. Three months ended Nine months ended 2021 2020 2021 2020 Severance and termination costs $ (2.1) $ 17.9 $ (0.1) $ 62.5 Lease impairment costs (3.2) 26.6 (4.2) 92.3 Other restructuring costs 1.8 2.8 1.9 5.1 Total restructuring charges $ (3.5) $ 47.3 $ (2.4) $ 159.9 Net restructuring charges were comprised of $(0.6) at IAN, $(0.6) at DXTRA and $(2.3) at Corporate and Other for the three months ended September 30, 2021, which include non-cash lease impairment costs of $(2.1) at IAN and $(1.1) at DXTRA. Net restructuring charges were comprised of $0.0 at IAN, $(0.1) at DXTRA and $(2.3) at Corporate and Other for the nine months ended September 30, 2021, which include non-cash lease impairment costs of $(2.8) at IAN and $(1.4) at DXTRA. Net restructuring charges were comprised of $24.9 at IAN and $17.2 at DXTRA for the three months ended September 30, 2020, which include non-cash lease impairment costs of $14.3 and $12.8, respectively. Net restructuring charges were comprised of $93.7 at IAN and $53.9 at DXTRA for the nine months ended September 30, 2020, which include non-cash lease impairment costs of $50.1 and $39.6, respectively. A summary of the restructuring activities taken in the first nine months of 2021 related to the 2020 Restructuring Plan is as follows: 2020 Restructuring Plan Liability at December 31, 2020 Restructuring Expense Non-Cash Items Cash Payments Liability at September 30, 2021 Severance and termination costs $ 74.6 $ (0.1) $ 0.3 $ 61.4 $ 12.8 Lease impairment costs 0.0 (4.2) (4.2) 0.0 0.0 Other restructuring costs 0.0 1.9 1.7 0.2 0.0 Total $ 74.6 $ (2.4) $ (2.2) $ 61.6 $ 12.8

Incentive Compensation Plans (N

Incentive Compensation Plans (Notes)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Incentive Compensation Plans	Incentive Compensation Plans We issue stock-based compensation and cash awards to our employees under various plans established by the Compensation and Leadership Talent Committee of the Board of Directors (the "Compensation Committee") and approved by our stockholders. We issued the following stock-based awards under the 2019 Performance Incentive Plan (the "2019 PIP") during the nine months ended September 30, 2021. Awards Weighted-average Restricted stock (units) 0.9 $ 26.67 Performance-based stock (shares) 0.5 $ 21.98 Stock options (shares) 0.3 $ 3.94 Total stock-based compensation awards 1.7 During the nine months ended September 30, 2021, the Compensation Committee granted performance cash awards under the 2019 PIP and restricted cash awards under the 2020 Restricted Cash Plan with a total annual target value of $40.0 and $84.6, respectively. Cash awards are expensed over the vesting period, which is typically three years for performance cash awards and two years or three years for restricted cash awards.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss, Net of Tax (Notes)	9 Months Ended
	Sep. 30, 2021
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 Derivative Defined Benefit Pension and Other Postretirement Plans Total Balance as of December 31, 2020 $ (637.6) $ 6.8 $ (249.4) $ (880.2) Other comprehensive (loss) income before reclassifications (74.7) 14.4 2.8 (57.5) Amount reclassified from accumulated other comprehensive loss, net of tax (1.0) 3.5 6.8 9.3 Balance as of September 30, 2021 $ (713.3) $ 24.7 $ (239.8) $ (928.4) Foreign Currency Derivative Defined Benefit Pension and Other Postretirement Plans Total Balance as of December 31, 2019 $ (697.7) $ (3.5) $ (228.8) $ (930.0) Other comprehensive (loss) income before reclassifications (56.2) 2.7 0.8 (52.7) Amount reclassified from accumulated other comprehensive loss, net of tax 9.3 1.3 4.3 14.9 Balance as of September 30, 2020 $ (744.6) $ 0.5 $ (223.7) $ (967.8) Amounts reclassified from accumulated other comprehensive loss, net of tax, for the three and nine months ended September 30, 2021 and 2020 are as follows: Three months ended Nine months ended Affected Line Item in the Consolidated Statements of Operations 2021 2020 2021 2020 Foreign currency translation adjustments $ 0.5 $ 9.6 $ (1.0) $ 9.3 Other income (expense), net Net (gain) loss on derivative instruments (0.3) 0.6 4.6 1.8 Other income (expense), net, Interest expense Amortization of defined benefit pension and postretirement plan items 3.6 1.8 8.4 5.5 Other income (expense), net Tax effect (0.4) (0.6) (2.7) (1.7) Provision for (benefit of) income taxes Total amount reclassified from accumulated other comprehensive loss, net of tax $ 3.4 $ 11.4 $ 9.3 $ 14.9

Employee Benefits (Notes)

Employee Benefits (Notes)	9 Months Ended
	Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [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 o bligation . 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 September 30, 2021 2020 2021 2020 2021 2020 Service cost $ 0.0 $ 0.0 $ 1.1 $ 1.2 $ 0.0 $ 0.0 Interest cost 0.7 0.9 2.0 2.4 0.2 0.2 Expected return on plan assets (1.4) (1.4) (5.2) (4.7) 0.0 0.0 Settlements 1.2 0.0 0.0 0.0 0.0 0.0 Amortization of: Prior service cost (credit) 0.0 0.0 0.0 0.0 0.0 (0.1) Unrecognized actuarial losses 0.5 0.4 1.7 1.4 0.2 0.1 Net periodic cost $ 1.0 $ (0.1) $ (0.4) $ 0.3 $ 0.4 $ 0.2 Domestic Pension Plan Foreign Pension Plans Domestic Postretirement Benefit Plan Nine Months Ended September 30, 2021 2020 2021 2020 2021 2020 Service cost $ 0.0 $ 0.0 $ 3.3 $ 3.5 $ 0.0 $ 0.0 Interest cost 2.2 2.8 6.0 7.0 0.5 0.6 Expected return on plan assets (4.2) (4.2) (15.7) (14.0) 0.0 0.0 Settlements 1.2 0.0 0.0 0.0 0.0 0.0 Amortization of: Prior service cost (credit) 0.0 0.0 0.1 0.1 0.0 (0.1) Unrecognized actuarial losses 1.3 1.2 5.1 4.1 0.7 0.2 Net periodic cost $ 0.5 $ (0.2) $ (1.2) $ 0.7 $ 1.2 $ 0.7 The components of net periodic cost other than the service cost component are included in the line item “Other income (expense), net” in the Consolidated Statements of Operations. During the nine months ended September 30, 2021, we contributed $2.0 and $13.8 of cash to our domestic and foreign pension plans, respectively. For the remainder of 2021, we expect to contribute approximately $0.0 and $5.0 of cash to our domestic and foreign pension plans, respectively.

Segment Information (Notes)

Segment Information (Notes)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment Reporting Disclosure	Segment Information As of September 30, 2021, we have two reportable segments: IAN and DXTRA. IAN is comprised of McCann Worldgroup; Foote, Cone & Belding ("FCB"); MullenLowe Group; Media, Data Services and Tech, which includes IPG Mediabrands, Acxiom and Kinesso; our digital specialist agencies; and our domestic integrated agencies. DXTRA is comprised of a number of our specialist marketing services offerings including Weber Shandwick, DeVries, Golin, FutureBrand, Jack Morton and Octagon Worldwide. We also report results for the Corporate and Other group. We continue to evaluate our financial reporting structure, and the profitability measure, employed by our chief operating decision maker for allocating resources to operating divisions and assessing operating division performance, is segment EBITA. Summarized financial information concerning our reportable segments is shown in the following table. Three months ended Nine months ended 2021 2020 2021 2020 Total revenue: IAN $ 2,085.7 $ 1,783.6 $ 6,014.9 $ 5,274.9 DXTRA 456.3 341.9 1,293.7 1,236.1 Total $ 2,542.0 $ 2,125.5 $ 7,308.6 $ 6,511.0 Net revenue: IAN $ 1,942.7 $ 1,685.5 $ 5,631.3 $ 4,935.7 DXTRA 319.0 269.1 927.7 844.4 Total $ 2,261.7 $ 1,954.6 $ 6,559.0 $ 5,780.1 Segment EBITA 1 : IAN $ 352.0 $ 260.0 $ 989.2 $ 459.4 DXTRA 53.3 25.9 148.4 21.9 Corporate and Other (32.3) (16.0) (94.0) (51.9) Total $ 373.0 $ 269.9 $ 1,043.6 $ 429.4 Amortization of acquired intangibles: IAN $ 20.4 $ 20.2 $ 61.3 $ 61.2 DXTRA 1.1 1.1 3.4 3.2 Corporate and Other 0.0 0.0 0.0 0.0 Total $ 21.5 $ 21.3 $ 64.7 $ 64.4 Depreciation and amortization 2 : IAN $ 41.5 $ 43.8 $ 125.0 $ 133.8 DXTRA 3.9 5.0 12.5 15.5 Corporate and Other 2.5 0.9 6.5 3.2 Total $ 47.9 $ 49.7 $ 144.0 $ 152.5 Capital expenditures: IAN $ 52.5 $ 31.7 $ 101.7 $ 85.2 DXTRA 2.4 1.2 4.7 4.1 Corporate and Other 6.4 7.2 17.0 22.7 Total $ 61.3 $ 40.1 $ 123.4 $ 112.0 1 Adjusted EBITA is calculated as net income available to IPG common stockholders before provision for (benefit of) incomes taxes, total (expenses) and other income, equity in net income (loss) of unconsolidated affiliates, net (income) loss attributable to non-controlling interests and amortization of acquired intangibles. 2 Excludes amortization of acquired intangibles. September 30, December 31, Total assets: IAN $ 14,286.1 $ 14,784.5 DXTRA 1,577.2 1,549.2 Corporate and Other 1,942.0 1,709.0 Total $ 17,805.3 $ 18,042.7 The following table presents the reconciliation of segment EBITA to Income before income taxes. Three months ended Nine months ended 2021 2020 2021 2020 IAN EBITA $ 352.0 $ 260.0 $ 989.2 $ 459.4 DXTRA EBITA 53.3 25.9 148.4 21.9 Corporate and Other EBITA (32.3) (16.0) (94.0) (51.9) Less: consolidated amortization of acquired intangibles 21.5 21.3 64.7 64.4 Operating income 351.5 248.6 978.9 365.0 Total (expenses) and other income (33.2) (56.0) (190.1) (177.3) Income before income taxes $ 318.3 $ 192.6 $ 788.8 $ 187.7

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	9 Months Ended
	Sep. 30, 2021
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 nine months ended September 30, 2021. The following tables present information about our financial instruments measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020, and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value. September 30, 2021 Balance Sheet Classification Level 1 Level 2 Level 3 Total Assets Cash equivalents $ 1,572.1 $ 0.0 $ 0.0 $ 1,572.1 Cash and cash equivalents Liabilities Contingent acquisition obligations 1 $ 0.0 $ 0.0 $ 34.3 $ 34.3 Accrued liabilities and Other non-current liabilities December 31, 2020 Balance Sheet Classification Level 1 Level 2 Level 3 Total Assets Cash equivalents $ 1,507.4 $ 0.0 $ 0.0 $ 1,507.4 Cash and cash equivalents Liabilities Contingent acquisition obligations 1 $ 0.0 $ 0.0 $ 95.5 $ 95.5 Accrued liabilities and Other non-current liabilities 1 Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional non-controlling 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 $61.2 from December 31, 2020 to September 30, 2021 is primarily due to payments related to our deferred acquisitions payments from prior-year acquisitions and the effect of the deconsolidation of a previously consolidated entity, partially offset by the exercises of redeemable non-controlling interest and valuation adjustments in our consolidated subsidiaries. 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 September 30, 2021 and December 31, 2020, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value. September 30, 2021 December 31, 2020 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Total long-term debt $ 0.0 $ 3,834.5 $ 40.8 $ 3,875.3 $ 0.0 $ 3,951.1 $ 43.9 $ 3,995.0 Our long-term debt is comprised of senior notes and other notes payable. The fair value of our senior notes, which are traded over-the-counter, is based on quoted prices in markets that are not active. Therefore, these senior notes are classified as Level 2. Our other notes payable are not actively traded, and their fair value is not solely derived from readily observable inputs. The fair value of our other notes payable is determined based on a discounted cash flow model and other proprietary valuation methods, and therefore is classified as Level 3. See Note 3 for further information on our long-term debt. The discount rates used as significant unobservable inputs in the Level 3 fair value measurements of our contingent acquisition obligations and long-term debt as of September 30, 2021 ranged fr om 1.0% to 4.0% a n d 0.4% to 3.4%, respectively. Non-financial Assets and Liabilities that are Measured at Fair Value on a Nonrecurring Basis

Commitments and Contingencies (

Commitments and Contingencies (Notes)	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Guarantees As discussed in our 2020 Annual Report, we have guaranteed certain obligations of our subsidiaries relating principally to operating leases, uncommitted lines of credit and cash pooling arrangements. As of September 30, 2021 and December 31, 2020, the amount of parent company guarantees on lease obligations was $577.0 and $630.8, respectively, the amount of parent company guarantees relating to uncommitted lines of credit was $424.0 and $399.6, respectively, and the amount of parent company guarantees related to daylight overdrafts, primarily utilized to manage intra-day overdrafts due to timing of transactions under cash pooling arrangements without resulting in incremental borrowings, was $105.5 and $109.2, respectively. In the event of non-payment by the applicable subsidiary of the obligations covered by a guarantee, we would be obligated to pay the amounts covered by that guarantee. As of September 30, 2021, there were no material assets pledged as security for such parent company guarantees. 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 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.

Recent Accounting Standards (No

Recent Accounting Standards (Notes)	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [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. Income Taxes In December 2019, the Financial Accounting Standards Board issued amended guidance to simplify the accounting for income taxes by removing certain exceptions and amending certain sections of existing guidance under ASC 740. This amended guidance was effective beginning January 1, 2021. The adoption of this amended guidance did not have a material impact on our Consolidated Financial Statements.

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue Principal Geographic Markets	Our agencies are located in over 100 countries, including every significant world market. Our geographic revenue breakdown is listed below. Three months ended Nine months ended Total revenue: 2021 2020 2021 2020 United States $ 1,612.1 $ 1,354.8 $ 4,595.8 $ 4,234.0 International: United Kingdom 224.3 172.4 637.4 528.8 Continental Europe 200.2 174.5 625.6 508.5 Asia Pacific 229.0 198.1 673.1 609.9 Latin America 104.3 83.2 290.1 235.7 Other 172.1 142.5 486.6 394.1 Total International 929.9 770.7 2,712.8 2,277.0 Total Consolidated $ 2,542.0 $ 2,125.5 $ 7,308.6 $ 6,511.0 Three months ended Nine months ended Net revenue: 2021 2020 2021 2020 United States $ 1,459.3 $ 1,273.4 $ 4,204.6 $ 3,820.6 International: United Kingdom 195.1 162.0 573.7 474.9 Continental Europe 178.1 158.0 559.4 453.7 Asia Pacific 192.0 166.0 553.6 487.4 Latin America 96.3 78.5 268.6 220.1 Other 140.9 116.7 399.1 323.4 Total International 802.4 681.2 2,354.4 1,959.5 Total Consolidated $ 2,261.7 $ 1,954.6 $ 6,559.0 $ 5,780.1 IAN Three months ended Nine months ended Total revenue: 2021 2020 2021 2020 United States $ 1,306.2 $ 1,130.5 $ 3,731.4 $ 3,402.7 International 779.5 653.1 2,283.5 1,872.2 Total IAN $ 2,085.7 $ 1,783.6 $ 6,014.9 $ 5,274.9 Net revenue: United States $ 1,242.3 $ 1,093.8 $ 3,581.1 $ 3,254.1 International 700.4 591.7 2,050.2 1,681.6 Total IAN $ 1,942.7 $ 1,685.5 $ 5,631.3 $ 4,935.7 DXTRA Three months ended Nine months ended Total revenue: 2021 2020 2021 2020 United States $ 305.9 $ 224.3 $ 864.4 $ 831.3 International 150.4 117.6 429.3 404.8 Total DXTRA $ 456.3 $ 341.9 $ 1,293.7 $ 1,236.1 Net revenue: United States $ 217.0 $ 179.6 $ 623.5 $ 566.5 International 102.0 89.5 304.2 277.9 Total DXTRA $ 319.0 $ 269.1 $ 927.7 $ 844.4
Contract Balances	The following table provides information about receivables, contract assets and contract liabilities from contracts with customers. September 30, December 31, Accounts receivable, net of allowance of $84.6 and $98.3, respectively $ 4,042.5 $ 4,646.4 Accounts receivable, billable to clients 2,150.4 1,820.7 Contract assets 50.2 51.8 Contract liabilities (deferred revenue) 622.2 657.8

Debt and Credit Arrangements (T

Debt and Credit Arrangements (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Summary of Carrying Amounts and Fair Values of Long-term Debt	A summary of the carrying amounts of our long-term debt is listed below. Effective September 30, December 31, 3.750% Senior Notes due 2021 3.980% $ 500.0 $ 499.1 4.000% Senior Notes due 2022 4.130% — 249.3 3.750% Senior Notes due 2023 4.320% — 498.8 4.200% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.2 and $0.5, respectively) 4.240% 249.3 498.3 4.650% Senior Notes due 2028 (less unamortized discount and issuance costs of $1.3 and $3.1, respectively) 4.780% 495.6 495.2 4.750% Senior Notes due 2030 (less unamortized discount and issuance costs of $3.4 and $5.2, respectively) 4.920% 641.4 640.8 2.400% Senior Notes due 2031 (less unamortized discount and issuance costs of $0.8 and $4.4, respectively) 2.512% 494.8 — 3.375% Senior Notes due 2041 (less unamortized discount and issuance costs of $1.1 and $5.6, respectively) 3.448% 493.3 — 5.400% Senior Notes due 2048 (less unamortized discount and issuance costs of $2.7 and $5.0, respectively) 5.480% 492.3 492.1 Other notes payable and capitalized leases 42.0 44.7 Total long-term debt 3,408.7 3,418.3 Less: current portion 500.4 502.5 Long-term debt, excluding current portion $ 2,908.3 $ 2,915.8

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, Nine Months Ended 2021 2020 2021 2020 Net income available to IPG common stockholders $ 239.9 $ 279.7 $ 594.9 $ 238.8 Weighted-average number of common shares outstanding - basic 393.5 389.6 392.8 388.9 Dilutive effect of stock options and restricted shares 6.3 4.3 5.5 3.7 Weighted-average number of common shares outstanding - diluted 399.8 393.9 398.3 392.6 Earnings per share available to IPG common stockholders: Basic $ 0.61 $ 0.72 $ 1.51 $ 0.61 Diluted $ 0.60 $ 0.71 $ 1.49 $ 0.61

Supplementary Data (Tables)

Supplementary Data (Tables)	9 Months Ended
	Sep. 30, 2021
Supplementary Data [Abstract]
Accrued Liabilities	The following table presents the components of accrued liabilities. September 30, December 31, Salaries, benefits and related expenses $ 569.2 $ 504.6 Interest 44.0 43.6 Office and related expenses 20.4 25.5 Acquisition obligations 15.7 47.9 Restructuring charges 11.5 69.5 Income taxes payable 4.1 50.6 Other 95.5 90.7 Total accrued liabilities $ 760.4 $ 832.4
Other Income (Expense), Net	Results of operations for the three and nine months ended September 30, 2021 and 2020 include certain items that are not directly associated with our revenue-producing operations. Three months ended Nine months ended 2021 2020 2021 2020 Loss on early extinguishment of debt $ — $ — $ (74.0) $ — Net losses on sales of businesses (4.4) (8.6) (18.6) (51.8) Other 6.7 (2.7) 15.7 (2.8) Total other income (expense), net $ 2.3 $ (11.3) $ (76.9) $ (54.6)
Redeemable Noncontrolling Interest [Table Text Block]	Redeemable Non-controlling Interests Many of our acquisitions include provisions under which the non-controlling equity owners may require us to purchase additional interests in a subsidiary at their discretion. Redeemable non-controlling interests are adjusted quarterly, if necessary, to their estimated redemption value, but not less than their initial fair value. Any adjustments to the redemption value impact retained earnings or additional paid in capital, except for foreign currency translation adjustments. The following table presents changes in our redeemable non-controlling interests. Nine months ended 2021 2020 Balance at beginning of period $ 93.1 $ 164.7 Change in related non-controlling interests balance 1.1 (6.0) Changes in redemption value of redeemable non-controlling interests: Redemptions (22.7) (2.5) Redemption value adjustments 1.1 (3.4) Balance at end of period $ 72.6 $ 152.8

Restructuring Charges (Tables)

Restructuring Charges (Tables)	9 Months Ended
	Sep. 30, 2021
Restructuring Charges [Abstract]
Restructuring and Related Costs [Table Text Block]	The components of the restructuring charges related to the 2020 Restructuring Plan are listed below. Three months ended Nine months ended 2021 2020 2021 2020 Severance and termination costs $ (2.1) $ 17.9 $ (0.1) $ 62.5 Lease impairment costs (3.2) 26.6 (4.2) 92.3 Other restructuring costs 1.8 2.8 1.9 5.1 Total restructuring charges $ (3.5) $ 47.3 $ (2.4) $ 159.9
Schedule of Restructuring activities related to the 2020 Plan [Table Text Block]	A summary of the restructuring activities taken in the first nine months of 2021 related to the 2020 Restructuring Plan is as follows: 2020 Restructuring Plan Liability at December 31, 2020 Restructuring Expense Non-Cash Items Cash Payments Liability at September 30, 2021 Severance and termination costs $ 74.6 $ (0.1) $ 0.3 $ 61.4 $ 12.8 Lease impairment costs 0.0 (4.2) (4.2) 0.0 0.0 Other restructuring costs 0.0 1.9 1.7 0.2 0.0 Total $ 74.6 $ (2.4) $ (2.2) $ 61.6 $ 12.8

Incentive Compensation Plans (T

Incentive Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Stock-based Compensation Awards	We issued the following stock-based awards under the 2019 Performance Incentive Plan (the "2019 PIP") during the nine months ended September 30, 2021. Awards Weighted-average Restricted stock (units) 0.9 $ 26.67 Performance-based stock (shares) 0.5 $ 21.98 Stock options (shares) 0.3 $ 3.94 Total stock-based compensation awards 1.7

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss, Net of Tax (Tables)	9 Months Ended
	Sep. 30, 2021
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 Derivative Defined Benefit Pension and Other Postretirement Plans Total Balance as of December 31, 2020 $ (637.6) $ 6.8 $ (249.4) $ (880.2) Other comprehensive (loss) income before reclassifications (74.7) 14.4 2.8 (57.5) Amount reclassified from accumulated other comprehensive loss, net of tax (1.0) 3.5 6.8 9.3 Balance as of September 30, 2021 $ (713.3) $ 24.7 $ (239.8) $ (928.4) Foreign Currency Derivative Defined Benefit Pension and Other Postretirement Plans Total Balance as of December 31, 2019 $ (697.7) $ (3.5) $ (228.8) $ (930.0) Other comprehensive (loss) income before reclassifications (56.2) 2.7 0.8 (52.7) Amount reclassified from accumulated other comprehensive loss, net of tax 9.3 1.3 4.3 14.9 Balance as of September 30, 2020 $ (744.6) $ 0.5 $ (223.7) $ (967.8)
Reclassification out of Accumulated Other Comprehensive Income	Amounts reclassified from accumulated other comprehensive loss, net of tax, for the three and nine months ended September 30, 2021 and 2020 are as follows: Three months ended Nine months ended Affected Line Item in the Consolidated Statements of Operations 2021 2020 2021 2020 Foreign currency translation adjustments $ 0.5 $ 9.6 $ (1.0) $ 9.3 Other income (expense), net Net (gain) loss on derivative instruments (0.3) 0.6 4.6 1.8 Other income (expense), net, Interest expense Amortization of defined benefit pension and postretirement plan items 3.6 1.8 8.4 5.5 Other income (expense), net Tax effect (0.4) (0.6) (2.7) (1.7) Provision for (benefit of) income taxes Total amount reclassified from accumulated other comprehensive loss, net of tax $ 3.4 $ 11.4 $ 9.3 $ 14.9

Employee Benefits (Tables)

Employee Benefits (Tables)	9 Months Ended
	Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [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 September 30, 2021 2020 2021 2020 2021 2020 Service cost $ 0.0 $ 0.0 $ 1.1 $ 1.2 $ 0.0 $ 0.0 Interest cost 0.7 0.9 2.0 2.4 0.2 0.2 Expected return on plan assets (1.4) (1.4) (5.2) (4.7) 0.0 0.0 Settlements 1.2 0.0 0.0 0.0 0.0 0.0 Amortization of: Prior service cost (credit) 0.0 0.0 0.0 0.0 0.0 (0.1) Unrecognized actuarial losses 0.5 0.4 1.7 1.4 0.2 0.1 Net periodic cost $ 1.0 $ (0.1) $ (0.4) $ 0.3 $ 0.4 $ 0.2 Domestic Pension Plan Foreign Pension Plans Domestic Postretirement Benefit Plan Nine Months Ended September 30, 2021 2020 2021 2020 2021 2020 Service cost $ 0.0 $ 0.0 $ 3.3 $ 3.5 $ 0.0 $ 0.0 Interest cost 2.2 2.8 6.0 7.0 0.5 0.6 Expected return on plan assets (4.2) (4.2) (15.7) (14.0) 0.0 0.0 Settlements 1.2 0.0 0.0 0.0 0.0 0.0 Amortization of: Prior service cost (credit) 0.0 0.0 0.1 0.1 0.0 (0.1) Unrecognized actuarial losses 1.3 1.2 5.1 4.1 0.7 0.2 Net periodic cost $ 0.5 $ (0.2) $ (1.2) $ 0.7 $ 1.2 $ 0.7

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Summarized financial information concerning reportable segments	Summarized financial information concerning our reportable segments is shown in the following table. Three months ended Nine months ended 2021 2020 2021 2020 Total revenue: IAN $ 2,085.7 $ 1,783.6 $ 6,014.9 $ 5,274.9 DXTRA 456.3 341.9 1,293.7 1,236.1 Total $ 2,542.0 $ 2,125.5 $ 7,308.6 $ 6,511.0 Net revenue: IAN $ 1,942.7 $ 1,685.5 $ 5,631.3 $ 4,935.7 DXTRA 319.0 269.1 927.7 844.4 Total $ 2,261.7 $ 1,954.6 $ 6,559.0 $ 5,780.1 Segment EBITA 1 : IAN $ 352.0 $ 260.0 $ 989.2 $ 459.4 DXTRA 53.3 25.9 148.4 21.9 Corporate and Other (32.3) (16.0) (94.0) (51.9) Total $ 373.0 $ 269.9 $ 1,043.6 $ 429.4 Amortization of acquired intangibles: IAN $ 20.4 $ 20.2 $ 61.3 $ 61.2 DXTRA 1.1 1.1 3.4 3.2 Corporate and Other 0.0 0.0 0.0 0.0 Total $ 21.5 $ 21.3 $ 64.7 $ 64.4 Depreciation and amortization 2 : IAN $ 41.5 $ 43.8 $ 125.0 $ 133.8 DXTRA 3.9 5.0 12.5 15.5 Corporate and Other 2.5 0.9 6.5 3.2 Total $ 47.9 $ 49.7 $ 144.0 $ 152.5 Capital expenditures: IAN $ 52.5 $ 31.7 $ 101.7 $ 85.2 DXTRA 2.4 1.2 4.7 4.1 Corporate and Other 6.4 7.2 17.0 22.7 Total $ 61.3 $ 40.1 $ 123.4 $ 112.0 1 Adjusted EBITA is calculated as net income available to IPG common stockholders before provision for (benefit of) incomes taxes, total (expenses) and other income, equity in net income (loss) of unconsolidated affiliates, net (income) loss attributable to non-controlling interests and amortization of acquired intangibles. 2 Excludes amortization of acquired intangibles. September 30, December 31, Total assets: IAN $ 14,286.1 $ 14,784.5 DXTRA 1,577.2 1,549.2 Corporate and Other 1,942.0 1,709.0 Total $ 17,805.3 $ 18,042.7 The following table presents the reconciliation of segment EBITA to Income before income taxes. Three months ended Nine months ended 2021 2020 2021 2020 IAN EBITA $ 352.0 $ 260.0 $ 989.2 $ 459.4 DXTRA EBITA 53.3 25.9 148.4 21.9 Corporate and Other EBITA (32.3) (16.0) (94.0) (51.9) Less: consolidated amortization of acquired intangibles 21.5 21.3 64.7 64.4 Operating income 351.5 248.6 978.9 365.0 Total (expenses) and other income (33.2) (56.0) (190.1) (177.3) Income before income taxes $ 318.3 $ 192.6 $ 788.8 $ 187.7

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, 2021 and December 31, 2020, and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value. September 30, 2021 Balance Sheet Classification Level 1 Level 2 Level 3 Total Assets Cash equivalents $ 1,572.1 $ 0.0 $ 0.0 $ 1,572.1 Cash and cash equivalents Liabilities Contingent acquisition obligations 1 $ 0.0 $ 0.0 $ 34.3 $ 34.3 Accrued liabilities and Other non-current liabilities December 31, 2020 Balance Sheet Classification Level 1 Level 2 Level 3 Total Assets Cash equivalents $ 1,507.4 $ 0.0 $ 0.0 $ 1,507.4 Cash and cash equivalents Liabilities Contingent acquisition obligations 1 $ 0.0 $ 0.0 $ 95.5 $ 95.5 Accrued liabilities and Other non-current liabilities 1 Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional non-controlling 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 $61.2 from December 31, 2020 to September 30, 2021 is primarily due to payments related to our deferred acquisitions payments from prior-year acquisitions and the effect of the deconsolidation of a previously consolidated entity, partially offset by the exercises of redeemable non-controlling interest and valuation adjustments in our consolidated subsidiaries. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.	[1]
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 September 30, 2021 and December 31, 2020, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value. September 30, 2021 December 31, 2020 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Total long-term debt $ 0.0 $ 3,834.5 $ 40.8 $ 3,875.3 $ 0.0 $ 3,951.1 $ 43.9 $ 3,995.0
[1]	Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional non-controlling 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 $61.2 from December 31, 2020 to September 30, 2021 is primarily due to payments related to our deferred acquisitions payments from prior-year acquisitions and the effect of the deconsolidation of a previously consolidated entity, partially offset by the exercises of redeemable non-controlling interest and valuation adjustments in our consolidated subsidiaries. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.

Revenue Major Geographical Area

Revenue Major Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total revenues:
Total revenue	$ 2,542	$ 2,125.5	$ 7,308.6	$ 6,511
Net revenue	2,261.7	1,954.6	6,559	5,780.1
United States
Total revenues:
Total revenue	1,612.1	1,354.8	4,595.8	4,234
Net revenue	1,459.3	1,273.4	4,204.6	3,820.6
United Kingdom
Total revenues:
Total revenue	224.3	172.4	637.4	528.8
Net revenue	195.1	162	573.7	474.9
Continental Europe
Total revenues:
Total revenue	200.2	174.5	625.6	508.5
Net revenue	178.1	158	559.4	453.7
Asia Pacific
Total revenues:
Total revenue	229	198.1	673.1	609.9
Net revenue	192	166	553.6	487.4
Latin America
Total revenues:
Total revenue	104.3	83.2	290.1	235.7
Net revenue	96.3	78.5	268.6	220.1
Other
Total revenues:
Total revenue	172.1	142.5	486.6	394.1
Net revenue	140.9	116.7	399.1	323.4
International
Total revenues:
Total revenue	929.9	770.7	2,712.8	2,277
Net revenue	802.4	681.2	2,354.4	1,959.5
IAN
Total revenues:
Total revenue	2,085.7	1,783.6	6,014.9	5,274.9
Net revenue	1,942.7	1,685.5	5,631.3	4,935.7
IAN | United States
Total revenues:
Total revenue	1,306.2	1,130.5	3,731.4	3,402.7
Net revenue	1,242.3	1,093.8	3,581.1	3,254.1
IAN | International
Total revenues:
Total revenue	779.5	653.1	2,283.5	1,872.2
Net revenue	700.4	591.7	2,050.2	1,681.6
DXTRA
Total revenues:
Total revenue	456.3	341.9	1,293.7	1,236.1
Net revenue	319	269.1	927.7	844.4
DXTRA | United States
Total revenues:
Total revenue	305.9	224.3	864.4	831.3
Net revenue	217	179.6	623.5	566.5
DXTRA | International
Total revenues:
Total revenue	150.4	117.6	429.3	404.8
Net revenue	$ 102	$ 89.5	$ 304.2	$ 277.9

Revenue Contract Balances (Deta

Revenue Contract Balances (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounts receivable, net of allowance of $84.6 and $98.3, respectively	$ 4,042.5	$ 4,646.4
Accounts receivable, billable to clients	2,150.4	1,820.7
Contract assets	50.2	51.8
Contract liabilities (deferred revenue)	622.2	$ 657.8
Revenue, Remaining Performance Obligation, Amount	$ 604.4

Long-term Debt (Details)

Long-term Debt (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 3,408,700,000		$ 3,408,700,000		$ 3,418,300,000
Long-term Debt, Fair Value	3,875,300,000		3,875,300,000		3,995,000,000
Long-term Debt, Current Maturities	500,400,000		500,400,000		502,500,000
Long-term Debt, Excluding Current Maturities	2,908,300,000		2,908,300,000		2,915,800,000
Loss on Extinguishment of Debt	0	$ 0	(74,000,000)	$ 0
3.750% Notes Due 2021 (less unamortized discount and issuance costs of $0.0 and $0.3, respectively)
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Maturity Date			Oct. 1, 2021
Interest Rate Stated Percentage	3.75%		3.75%
Effective Interest Rate	3.98%		3.98%
Long-term Debt, Gross	$ 500,000,000		$ 500,000,000		499,100,000
4.000% Notes Due 2022
Debt Instrument [Line Items]
Par Value	$ 250,000,000		$ 250,000,000
Interest Rate Stated Percentage	4.00%		4.00%
Effective Interest Rate	4.13%		4.13%
Long-term Debt, Gross	$ 0		$ 0		249,300,000
Loss on Extinguishment of Debt			9,200,000
3.750% Notes Due 2023
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Interest Rate Stated Percentage	3.75%		3.75%
Effective Interest Rate	4.32%		4.32%
Long-term Debt, Gross	$ 0		$ 0		498,800,000
Loss on Extinguishment of Debt			36,500,000
4.200% Notes Due 2024 (less unamortized discount and issuance costs of $0.2 and $0.5, respectively)
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Effective Interest Rate	4.24%		4.24%
Long-term Debt, Gross					498,300,000
4.650% Notes Due 2028 (less unamortized discount and issuance costs of $1.3 and $3.2, respectively)
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Maturity Date			Oct. 1, 2028
Interest Rate Stated Percentage	4.65%		4.65%
Effective Interest Rate	4.78%		4.78%
Unamortized Discount	$ 1,300,000		$ 1,300,000
Issuance Cost	3,100,000		3,100,000
Long-term Debt, Gross	495,600,000		495,600,000		495,200,000
4.750% Notes Due 2030 (less unamortized discount and issuance costs of $3.4 and $5.2, respectively)
Debt Instrument [Line Items]
Par Value	$ 650,000,000		$ 650,000,000
Maturity Date			Mar. 30, 2030
Interest Rate Stated Percentage	4.75%		4.75%
Effective Interest Rate	4.92%		4.92%
Unamortized Discount	$ 3,400,000		$ 3,400,000
Issuance Cost	5,200,000		5,200,000
Long-term Debt, Gross	641,400,000		641,400,000		640,800,000
2.400% Notes Due 2031 (less unamortized discount and issuance costs of $0.8 and $4.4, respectively)
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Maturity Date			Mar. 1, 2031
Effective Interest Rate	2.512%		2.512%
Unamortized Discount	$ 800,000		$ 800,000
Issuance Cost	4,400,000		4,400,000
Long-term Debt, Gross	$ 494,800,000		$ 494,800,000		0
3.375% Notes Due 2041 (less unamortized discount and issuance costs of $1.1 and $5.6, respectively)
Debt Instrument [Line Items]
Maturity Date			Mar. 1, 2041
Effective Interest Rate	3.448%		3.448%
Unamortized Discount	$ 1,100,000		$ 1,100,000
Issuance Cost	5,600,000		5,600,000
Long-term Debt, Gross	493,300,000		493,300,000		0
5.400% Notes Due 2048 (less unamortized discount and issuance costs of $2.7 and $5.1, respectively)
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Maturity Date			Oct. 1, 2048
Interest Rate Stated Percentage	5.40%		5.40%
Effective Interest Rate	5.48%		5.48%
Unamortized Discount	$ 2,700,000		$ 2,700,000
Issuance Cost	5,000,000		5,000,000
Long-term Debt, Gross	492,300,000		492,300,000		492,100,000
Other notes payable and capitalized leases
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 42,000,000		$ 42,000,000		$ 44,700,000
Unsecured Debt 2.400% Note [Member]
Debt Instrument [Line Items]
Interest Rate Stated Percentage	2.40%		2.40%
Unsecured Debt	$ 494,500,000		$ 494,500,000
Debt Instrument, Unamortized Discount	800,000		800,000
Debt Issuance Costs, Gross	4,700,000		4,700,000
Unsecured Debt 3.375% Note
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Interest Rate Stated Percentage	3.375%		3.375%
Unsecured Debt	$ 493,100,000		$ 493,100,000
Debt Instrument, Unamortized Discount	1,100,000		1,100,000
Debt Issuance Costs, Gross	5,800,000		5,800,000
Unsecured Debt 4.200% Notes Remaining Principal
Debt Instrument [Line Items]
Par Value	$ 250,000,000		$ 250,000,000
Maturity Date			Apr. 15, 2024
Interest Rate Stated Percentage	4.20%		4.20%
Unamortized Discount	$ 200,000		$ 200,000
Issuance Cost	500,000		500,000
Long-term Debt, Gross	$ 249,300,000		249,300,000
Loss on Extinguishment of Debt			$ 28,300,000

Credit Facilities (Details)

Credit Facilities (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021USD ($)Rate	Sep. 30, 2021USD ($)Rate
Committed credit facility [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,500	$ 1,500
Line of Credit Facility, Available Capacity Increase Amount	250	250
Line of Credit Facility, Limit on Letters of Credit	50	50
Line of Credit Outstanding, Amount	0	0
Letters of Credit Outstanding, Amount	10.7	10.7
Line of Credit Facility, Remaining Borrowing Capacity	1,489.3	1,489.3
Uncommitted credit facility [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	951.4	951.4
Line of Credit Outstanding, Amount	44.1	44.1
Line of Credit Facility, Average Outstanding Amount	$ 72.2
Short-term Debt, Weighted Average Interest Rate, over Time	2.80%
364 Day [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 500	$ 500
Margin for base rate advances | Rate	0.25%	0.25%
Margin for Eurocurrency rate advances | Rate	1.25%	1.25%
Line of Credit Facility, Commitment Fee Percentage | Rate		0.25%

Commercial Paper (Details)

Commercial Paper (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2021USD ($)
Debt Disclosure [Abstract]
Commercial paper borrowing capacity	$ 1,500	$ 1,500
Debt Instrument, Term		397 days
Commercial Paper, Average Outstanding	0
Commercial Paper	$ 0	$ 0

Debt and Credit Arrangements De

Debt and Credit Arrangements Debt Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Loss on Extinguishment of Debt	$ 0	$ 0	$ (74,000,000)	$ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	300,000	$ (600,000)	(4,600,000)	$ (1,800,000)
Unsecured Debt 3.75% Note Due in 2021 [Member]
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.75%		3.75%
Maturity Date			Oct. 1, 2021
4.000% Notes Due 2022
Debt Instrument [Line Items]
Par Value	$ 250,000,000		$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.00%		4.00%
Loss on Extinguishment of Debt			$ 9,200,000
Redemption Premium			8,600,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 600,000		600,000
Payment for Debt Extinguishment or Debt Prepayment Cost			258,900,000
3.750% Notes Due 2023
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.75%		3.75%
Loss on Extinguishment of Debt			$ 36,500,000
Redemption Premium			30,700,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 1,100,000		1,100,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			4,700,000
Payment for Debt Extinguishment or Debt Prepayment Cost			532,900,000
4.200% Notes Due 2024 (less unamortized discount and issuance costs of $0.2 and $0.5, respectively)
Debt Instrument [Line Items]
Par Value	500,000,000		500,000,000
Unsecured Debt 4.65% Notes [Member]
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.65%		4.65%
Maturity Date			Oct. 1, 2028
4.750% Notes Due 2030 (less unamortized discount and issuance costs of $3.4 and $5.2, respectively)
Debt Instrument [Line Items]
Par Value	$ 650,000,000		$ 650,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.75%		4.75%
Maturity Date			Mar. 30, 2030
Unsecured Debt 2.400% Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.40%		2.40%
Unsecured Debt	$ 494,500,000		$ 494,500,000
Debt Instrument, Unamortized Discount	800,000		800,000
Debt Issuance Costs, Gross	4,700,000		4,700,000
2.400% Notes Due 2031 (less unamortized discount and issuance costs of $0.8 and $4.4, respectively)
Debt Instrument [Line Items]
Par Value	500,000,000		$ 500,000,000
Maturity Date			Mar. 1, 2031
3.375% Notes Due 2041 (less unamortized discount and issuance costs of $1.1 and $5.6, respectively)
Debt Instrument [Line Items]
Maturity Date			Mar. 1, 2041
Unsecured Debt 5.40% Notes [Member]
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.40%		5.40%
Maturity Date			Oct. 1, 2048
Unsecured Debt 3.375% Note
Debt Instrument [Line Items]
Par Value	$ 500,000,000		$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.375%		3.375%
Unsecured Debt	$ 493,100,000		$ 493,100,000
Debt Instrument, Unamortized Discount	1,100,000		1,100,000
Debt Issuance Costs, Gross	5,800,000		5,800,000
Unsecured Debt 4.200% Notes Remaining Principal
Debt Instrument [Line Items]
Par Value	$ 250,000,000		$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.20%		4.20%
Loss on Extinguishment of Debt			$ 28,300,000
Redemption Premium			27,500,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 800,000		800,000
Payment for Debt Extinguishment or Debt Prepayment Cost			$ 282,200,000
Maturity Date			Apr. 15, 2024

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income available to IPG common stockholders	$ 239.9	$ 279.7	$ 594.9	$ 238.8
Weighted-average number of common shares outstanding, Basic	393.5	389.6	392.8	388.9
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6.3	4.3	5.5	3.7
Weighted-average number of common shares outstanding, Diluted	399.8	393.9	398.3	392.6
Earnings per share, Basic	$ 0.61	$ 0.72	$ 1.51	$ 0.61
Earnings per share, Diluted	$ 0.60	$ 0.71	$ 1.49	$ 0.61

Supplementary Data Accrued Liab

Supplementary Data Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Accrued Liabilities [Abstract]
Salaries, benefits and related expenses		$ 569.2	$ 504.6
Interest		44	43.6
Office and related expenses		20.4	25.5
Acquisition obligations		15.7	47.9
Restructuring charges		11.5	69.5
Income Taxes payable		4.1	50.6
Other		95.5	$ 90.7
Total Accrued Liabilities	$ 832.4	$ 760.4

Supplementary Data Other Expens

Supplementary Data Other Expense, Net (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Expense, Net [Abstract]
Loss on Extinguishment of Debt	$ 0	$ 0	$ (74,000,000)	$ 0
Net losses on sales of businesses	(4,400,000)	(8,600,000)	(18,600,000)	(51,800,000)
Other Expense, Net, Other	(6,700,000)	2,700,000	(15,700,000)	2,800,000
Other Nonoperating Income (Expense)	$ 2,300,000	$ (11,300,000)	$ (76,900,000)	$ (54,600,000)

Supplementary Data Share Repurc

Supplementary Data Share Repurchase Program (Details) $ in Millions	Sep. 30, 2021USD ($)
Disclosure of Repurchase Agreements [Abstract]
Stock repurchase program, remaining authorized repurchase amount, excluding fees	$ 338.4

Supplementary Data Redeemable N

Supplementary Data Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Redeemable Noncontrolling Interests [Abstract]
Redeemable noncontrolling interests	$ 72.6	$ 152.8	$ 93.1	$ 164.7
Noncontrolling interest related to redeemable noncontrolling interests	1.1	(6)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(22.7)	(2.5)
Redemption value adjustments	$ 1.1	$ (3.4)

Supplementary Data Leases (Deta

Supplementary Data Leases (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Text Block [Abstract]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 334,100,000	$ 246,800,000

Income Taxes Change in Unrecogn

Income Taxes Change in Unrecognized Tax Benefits (Details) $ in Millions	Sep. 30, 2021USD ($)
Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	$ 20
Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	$ 30

Restructuring Charges (Details)

Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Severance and termination costs	$ (2.1)	$ 17.9	$ (0.1)	$ 62.5
Lease impairment costs	(3.2)	26.6	(4.2)	92.3
Other restructuring costs	1.8	2.8	1.9	5.1
Restructuring charges	(3.5)	47.3	(2.4)	159.9
Severance and termination costs	(2.1)	17.9	(0.1)	62.5
Lease impairment costs	(3.2)	26.6	(4.2)	92.3
Other restructuring costs	1.8	2.8	1.9	5.1
Restructuring charges	$ (3.5)	$ 47.3	$ (2.4)	$ 159.9

Restructuring Charges Segments

Restructuring Charges Segments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (3,500,000)	$ 47,300,000	$ (2,400,000)	$ 159,900,000
Lease impairment costs	(3,200,000)	26,600,000	(4,200,000)	92,300,000
IAN [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(600,000)	24,900,000	0	93,700,000
Lease impairment costs	(2,100,000)	14,300,000	(2,800,000)	50,100,000
DXTRA [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(600,000)	17,200,000	(100,000)	53,900,000
Lease impairment costs	(1,100,000)	$ 12,800,000	(1,400,000)	$ 39,600,000
Corporate and Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (2,300,000)		$ (2,300,000)

Restructuring Charges 2020 Plan

Restructuring Charges 2020 Plan Restructuring Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Severance and termination costs	$ (2,100,000)	$ 17,900,000	$ (100,000)	$ 62,500,000
Lease impairment costs	(3,200,000)	26,600,000	(4,200,000)	92,300,000
Other restructuring costs	1,800,000	2,800,000	1,900,000	5,100,000
Restructuring charges	(3,500,000)	47,300,000	(2,400,000)	159,900,000
Restructuring Reserve	12,800,000		12,800,000		$ 74,600,000
DXTRA [Member]
Restructuring Cost and Reserve [Line Items]
Lease impairment costs	(1,100,000)	12,800,000	(1,400,000)	39,600,000
Restructuring charges	(600,000)	$ 17,200,000	(100,000)	$ 53,900,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	12,800,000		12,800,000		74,600,000
Lease impairment costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0		0		0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0		0		$ 0
Non-cash Items [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs			300,000
Lease impairment costs			(4,200,000)
Other restructuring costs			1,700,000
Restructuring charges			(2,200,000)
Cash Payments [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs			61,400,000
Lease impairment costs			0
Other restructuring costs			200,000
Restructuring charges			$ 61,600,000

Incentive Compensation Plans St

Incentive Compensation Plans Stock-based Compensation Awards (Details) shares in Millions	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Restricted stock (units)
Incentive Compensation Plans
Granted awards	0.9
Weighted average grant date fair value | $ / shares	$ 26.67
Performance-based stock (shares)
Incentive Compensation Plans
Granted awards	0.5
Exercise of stock options, value	0.3
Weighted average grant date fair value | $ / shares	$ 21.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ / shares	$ 3.94
Total stock-based compensation awards
Incentive Compensation Plans
Granted awards	1.7

Incentive Compensation Plans Pl

Incentive Compensation Plans Plan Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Share-based Payment Arrangement [Abstract]
Performance cash awards granted during the period target value	$ 40
Restricted cash awards granted during the period target value	$ 84.6
Performance based cash award vesting period	3 years
Restricted cash awards vesting period floor	2 years
Cash awards vesting period	3 years

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Foreign currency translation adjustment:
Balance at beginning of period	$ (637.6)	$ (697.7)
Other comprehensive (loss) income before reclassifications	(74.7)	(56.2)
Amount reclassified from accumulated other comprehensive loss, net of tax	(1)	9.3
Balance at end of period	(713.3)	(744.6)
Derivative Instrument:
Balance at beginning of period	6.8	(3.5)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	14.4	2.7
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(3.5)	(1.3)
Balance at end of period	24.7	0.5
Defined Benefit Pension and Other Postretirement Plans
Balance at beginning of period	(239.8)	(223.7)	$ (249.4)	$ (228.8)
Other comprehensive (loss) income before reclassifications	2.8	0.8
Amount reclassified from accumulated other comprehensive loss, net of tax	6.8	4.3
Total:
Balance at beginning of period	(880.2)	(930)
Other comprehensive (loss) income before reclassifications	(57.5)	(52.7)
Amount reclassified from accumulated other comprehensive loss, net of tax	9.3	14.9
Balance at end of period	$ (928.4)	$ (967.8)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss, Net of Tax Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	$ 0.5	$ 9.6	$ (1)	$ 9.3
Losses on derivative instruments	(0.3)	0.6	4.6	1.8
Amortization of defined benefit pension and postretirement plan items	3.6	1.8	8.4	5.5
Tax effect	(0.4)	(0.6)	(2.7)	(1.7)
Reclassifications from accumulated other comprehensive loss to earnings, net of tax	$ 3.4	$ 11.4	$ 9.3	$ 14.9

Employee Benefits (Details)

Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Pension and Postretirement Benefit Plans
Settlement and curtailments	$ (1.2)	$ 0	$ (1.2)	$ 0
Domestic Plan [Member]
Defined Pension and Postretirement Benefit Plans
Service cost	0	0	0	0
Interest cost	0.7	0.9	2.2	2.8
Expected return on plan assets	(1.4)	(1.4)	(4.2)	(4.2)
Settlement and curtailments	1.2	0	1.2	0
Amortization of:
Prior Service Cost (Credit)	0	0	0	0
Unrecognized actuarial losses	0.5	0.4	1.3	1.2
Net periodic cost	1	(0.1)	0.5	(0.2)
Pension plan - employer contributions			2
Pension plan - estimated employer contributions for remainder of current fiscal year	0		0
Foreign Plan [Member]
Defined Pension and Postretirement Benefit Plans
Service cost	1.1	1.2	3.3	3.5
Interest cost	2	2.4	6	7
Expected return on plan assets	(5.2)	(4.7)	(15.7)	(14)
Settlement and curtailments	0	0	0	0
Amortization of:
Prior Service Cost (Credit)	0	0	0.1	0.1
Unrecognized actuarial losses	1.7	1.4	5.1	4.1
Net periodic cost	(0.4)	0.3	(1.2)	0.7
Pension plan - employer contributions			13.8
Pension plan - estimated employer contributions for remainder of current fiscal year	5		5
Domestic Postretirement Benefit Plan
Defined Pension and Postretirement Benefit Plans
Service cost	0	0	0	0
Interest cost	0.2	0.2	0.5	0.6
Expected return on plan assets	0	0	0	0
Settlement and curtailments	0	0	0	0
Amortization of:
Prior Service Cost (Credit)	0	(0.1)	0	(0.1)
Unrecognized actuarial losses	0.2	0.1	0.7	0.2
Net periodic cost	$ 0.4	$ 0.2	$ 1.2	$ 0.7

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segments:
Total revenue	$ 2,542	$ 2,125.5	$ 7,308.6	$ 6,511
Net revenue	2,261.7	1,954.6	6,559	5,780.1
Segment EBITA	373	269.9	1,043.6	429.4
Amortization of acquired intangibles	21.5	21.3	64.7	64.4
Depreciation	47.9	49.7	144	152.5
Capital expenditures	61.3	40.1	123.4	112
Total assets	17,805.3		17,805.3		$ 18,042.7
Operating income	351.5	248.6	978.9	365
Total (expenses) and other income	(33.2)	(56)	(190.1)	(177.3)
Income before income taxes	318.3	192.6	788.8	187.7
IAN
Segments:
Total revenue	2,085.7	1,783.6	6,014.9	5,274.9
Net revenue	1,942.7	1,685.5	5,631.3	4,935.7
Segment EBITA	352	260	989.2	459.4
Amortization of acquired intangibles	20.4	20.2	61.3	61.2
Depreciation	41.5	43.8	125	133.8
Capital expenditures	52.5	31.7	101.7	85.2
Total assets	14,286.1		14,286.1		14,784.5
DXTRA
Segments:
Total revenue	456.3	341.9	1,293.7	1,236.1
Net revenue	319	269.1	927.7	844.4
Segment EBITA	53.3	25.9	148.4	21.9
Amortization of acquired intangibles	1.1	1.1	3.4	3.2
Depreciation	3.9	5	12.5	15.5
Capital expenditures	2.4	1.2	4.7	4.1
Total assets	1,577.2		1,577.2		1,549.2
Corporate and Other
Segments:
Segment EBITA	(32.3)	(16)	(94)	(51.9)
Amortization of acquired intangibles	0	0	0	0
Depreciation	2.5	0.9	6.5	3.2
Capital expenditures	6.4	$ 7.2	17	$ 22.7
Total assets	$ 1,942		$ 1,942		$ 1,709

Fair Value on a Recurring and N

Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2021	Dec. 31, 2020
Fair value assets and liabilities measured on recurring and nonrecurring basis
Contingent acquisition liability, total change		$ (61.2)
Long-term Debt, Fair Value		$ 3,875.3	$ 3,995
Discount rate floor contingent acquisition obligations		1.00%
Discount rate ceiling contingent acquisition obligations		4.00%
Discount rate floor long-term debt		0.40%
Discount rate ceiling long-term debt		3.40%
Level 1
Fair value assets and liabilities measured on recurring and nonrecurring basis
Cash equivalents		$ 1,572.1	1,507.4
Contingent acquisition obligations	[1]	0	0
Long-term Debt, Fair Value		0	0
Level 2
Fair value assets and liabilities measured on recurring and nonrecurring basis
Cash equivalents		0	0
Contingent acquisition obligations	[1]	0	0
Long-term Debt, Fair Value		3,834.5	3,951.1
Level 3
Fair value assets and liabilities measured on recurring and nonrecurring basis
Cash equivalents		0	0
Contingent acquisition obligations	[1]	34.3	95.5
Long-term Debt, Fair Value		40.8	43.9
Fair Value, Total [Member]
Fair value assets and liabilities measured on recurring and nonrecurring basis
Cash equivalents		1,572.1	1,507.4
Contingent acquisition obligations	[1]	34.3	95.5
Long-term Debt, Fair Value		$ 3,875.3	$ 3,995
[1]	Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional non-controlling 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 $61.2 from December 31, 2020 to September 30, 2021 is primarily due to payments related to our deferred acquisitions payments from prior-year acquisitions and the effect of the deconsolidation of a previously consolidated entity, partially offset by the exercises of redeemable non-controlling interest and valuation adjustments in our consolidated subsidiaries. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Lease guarantees	$ 577,000,000	$ 630,800,000
Credit facility guarantees	424,000,000	399,600,000
Cash pooling guarantees	105,500,000	$ 109,200,000
Assets pledged as security for parent company guarantees	$ 0