UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income	$ 93,415	$ 31,186
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Stock-based compensation	33,410	53,465
Depreciation and amortization	95,642	46,122
Impairment and other losses	28,034	14,926
Provision for bad debt expense	2,681	1,893
Deferred income taxes	(1,557)	2,710
Adjustment to deferred acquisition consideration	(14,420)	9,456
Other	(1,002)	6,998
Changes in working capital:
Accounts receivable	(34,637)	(26,095)
Expenditures billable to clients	5,525	(9,230)
Other assets	4,100	(14,568)
Accounts payable	34,630	(37,435)
Accrued expenses and other liabilities	(138,947)	(26,668)
Advance billings	(23,017)	16,598
Deferred acquisition related payments	(10,776)	(5,772)
Net Cash Provided by (Used in) Operating Activities, Total	73,081	20,146
Cash flows from investing activities:
Capital expenditures	(25,495)	(13,666)
Current period acquisitions, net of cash acquired	(37,461)	130,155
Other	(1,328)	0
Net Cash Provided by (Used in) Investing Activities, Total	(64,284)	153,721
Repayment of borrowings under revolving credit facility
Repayment of borrowings under revolving credit facility	(855,000)	(535,472)
Proceeds from borrowings under revolving credit facility	989,500	408,369
Shares acquired and cancelled	14,970	820
Distributions to noncontrolling interests and other	(38,486)	(19,245)
Payment of deferred consideration	(61,089)	0
Distributions	0	(204,929)
Repurchase of Common Stock	0	(884,398)
Repurchase of Common Stock	(28,667)	0
Net Cash Provided by (Used in) Financing Activities, Total	(12,312)	(151,860)
Effect of exchange rate changes on cash and cash equivalents	(15,243)	1,025
Net decrease in cash and cash equivalents	(18,758)	23,032
Cash and cash equivalents at beginning of period	184,009	92,457
Cash and cash equivalents at end of period	165,251	115,489
Supplemental disclosures:
Cash income taxes paid	23,315	42,346
Cash interest paid	61,016	22,493
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	0	426,396
Acquisitions of noncontrolling interest	0	37,559
Non-cash investing and financing activities:
Reduction of deferred tax liability related to the exchange of Paired Units	20,763	0
Establishment of Tax Receivables Agreement liability	17,649	0
Non-cash contributions	0	12,372
Non-cash distributions to Stagwell Media LP	0	13,000
Non-cash payment of deferred acquisition consideration	0	7,080
Purchase of noncontrolling interest	3,600	0
Proceeds from issuance of the 5.625% Notes	0	1,100,000
Debt issuance costs	0	(15,365)
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	0	(43,440)
Proceeds from Sale of Productive Assets	$ 0	$ 37,232