UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($)	Total	Approved plan	Members' capital	Stagwell Inc. Shareholders' Equity	Stagwell Inc. Shareholders' Equity Approved plan	Common Shares Common Class A & B	Common Shares Common Class A & B Approved plan	Common Shares Class C	Paid-in Capital	Paid-in Capital Approved plan	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning balance at Dec. 31, 2020			$ 358,756,000
Balance at Dec. 31, 2020	$ 398,543,000			$ 358,756,000									$ 39,787,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Noncontrolling Interests, Equity Statement Impact	24,333,000		21,710,000	21,710,000									2,623,000
Other Comprehensive Income (Loss), Net of Tax	(350,000)		(350,000)	(350,000)
Contribution from Limited Liability Company (LLC)	12,122,000		12,122,000	12,122,000
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared	(50,214,000)		(39,212,000)	(39,212,000)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders													(11,002,000)
Changes in redemption value of RNCI	(3,092,000)		(2,631,000)	(2,631,000)									(461,000)
Ending balance at Jun. 30, 2021			350,395,000
Balance at Jun. 30, 2021	381,342,000			350,395,000									30,947,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	21,710,000
Beginning balance at Mar. 31, 2021	345,122,000
Balance at Mar. 31, 2021	375,172,000			345,122,000									30,050,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Noncontrolling Interests, Equity Statement Impact	18,815,000			17,345,000
Other Comprehensive Income (Loss), Net of Tax	(487,000)		(487,000)	(487,000)
Contribution from Limited Liability Company (LLC)	1,854,000		1,854,000	1,854,000
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared	(11,320,000)		(11,208,000)	(11,208,000)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders													(112,000)
Changes in redemption value of RNCI	(2,692,000)		(2,231,000)	(2,231,000)									(461,000)
Ending balance at Jun. 30, 2021			350,395,000
Balance at Jun. 30, 2021	381,342,000			350,395,000									30,947,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	17,345,000
Net income			$ 17,345,000										1,470,000
Balance (in shares) at Dec. 31, 2021						118,252,000		179,970,000
Balance at Dec. 31, 2021	879,040,000			370,753,000		$ 118,000		$ 2,000	$ 382,893,000		$ (6,982,000)	$ (5,278,000)	508,287,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Noncontrolling Interests, Equity Statement Impact	56,675,000			23,138,000							23,138,000		33,537,000
Other Comprehensive Income (Loss), Net of Tax	(29,173,000)			(29,173,000)								(29,173,000)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(29,957,000)												(29,957,000)
Reduction of noncontrolling and redeemable noncontrolling interest	(4,600,000)			(1,000,000)					(1,000,000)				(3,600,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncontrolling Interest	2,667,000												2,667,000
Changes in redemption value of RNCI	(5,888,000)			(5,888,000)							(5,888,000)
Granting of restricted awards	0					$ 2,000			(2,000)
Granting of restricted awards (in shares)						1,989,000
Shares repurchased and cancelled (withheld for payroll taxes)	(14,926,000)	$ (14,841,000)		(14,926,000)	$ (14,841,000)		$ (2,000)		(14,926,000)	$ (14,839,000)
Shares acquired and cancelled (in shares)						(1,998,000)	(1,981,000)
Stock-based compensation	15,892,000			15,892,000					15,892,000
Conversion of shares						$ 15,000			(15,000)
Conversion of shares (in shares)						15,543,000		(15,543,000)
Stockholders' Equity, Other Shares						141,000
Other	2,495,000			344,000		$ (2,000)			342,000				2,151,000
Balance (in shares) at Jun. 30, 2022						131,838,000		164,427,000
Balance at Jun. 30, 2022	857,384,000			344,299,000		$ 135,000		$ 2,000	368,345,000		10,268,000	(34,451,000)	513,085,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	23,138,000
Balance (in shares) at Mar. 31, 2022						133,196,000		164,815,000
Balance at Mar. 31, 2022	897,845,000			369,480,000		$ 135,000		$ 2,000	373,300,000		6,668,000	(10,625,000)	528,365,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Noncontrolling Interests, Equity Statement Impact	25,463,000			10,463,000
Other Comprehensive Income (Loss), Net of Tax	(23,826,000)			(23,826,000)								(23,826,000)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(29,252,000)												(29,252,000)
Reduction of noncontrolling and redeemable noncontrolling interest	(4,600,000)			(1,000,000)					(1,000,000)				(3,600,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncontrolling Interest	2,667,000												2,667,000
Changes in redemption value of RNCI	(6,863,000)			(6,863,000)							(6,863,000)
Granting of restricted awards (in shares)						202,000
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited						(108,000)
Shares repurchased and cancelled (withheld for payroll taxes)	(14,841,000)				$ (14,841,000)		$ (2,000)			$ (14,839,000)
Shares acquired and cancelled (in shares)							(1,981,000)
Stock-based compensation	9,178,000			9,178,000					9,178,000
Conversion of shares (in shares)						388,000		(388,000)
Stockholders' Equity, Other Shares						141,000
Other	1,613,000			1,708,000		$ (2,000)			1,706,000				(95,000)
Balance (in shares) at Jun. 30, 2022						131,838,000		164,427,000
Balance at Jun. 30, 2022	857,384,000			$ 344,299,000		$ 135,000		$ 2,000	$ 368,345,000		10,268,000	$ (34,451,000)	513,085,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	$ 10,463,000										$ 10,463,000		$ 15,000,000