UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($)	Total	Approved plan	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
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) Attributable to Parent	12,675,000									12,675,000
Net income			12,675,000
Net income attributable to Stagwell Inc.	31,212,000
Other Comprehensive Income (Loss), Net of Tax	5,347,000		5,347,000								5,347,000
Distributions to noncontrolling interests	(705,000)											(705,000)
Changes in redemption value	975,000		975,000
Changes in redemption value of RNCI										975,000
Restricted Awards Granted or Vested (in shares)					1,787,000
Restricted awards granted or vested					$ (2,000)			2,000
Shares acquired and cancelled (in shares)					(1,998,000)
Shares acquired and cancelled	(14,926,000)		(14,926,000)					(14,926,000)
Stock-based compensation	6,714,000		6,714,000					6,714,000
Conversion of shares (in shares)					15,155,000		(15,155,000)
Conversion of Class C to Class A shares					$ 15,000			(15,000)
Other	882,000		(1,364,000)					(1,364,000)				2,246,000
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) Attributable to Nonredeemable Noncontrolling Interest	(18,537,000)
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]
Changes in redemption value	(8,711,000)
Balance (in shares) at Dec. 31, 2022					131,724,000		160,909,000
Balance at Dec. 31, 2022	944,634,000		482,537,000		$ 132,000		$ 2,000	491,899,000		29,445,000	(38,941,000)	462,097,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	443,000
Net income			443,000							443,000
Net income attributable to Stagwell Inc.	(2,474,000)
Other Comprehensive Income (Loss), Net of Tax	(4,425,000)		(25,688,000)								(25,688,000)	(21,263,000)
Distributions to noncontrolling interests	(8,025,000)											(8,025,000)
Changes in redemption value	(1,076,000)
Changes in redemption value of RNCI	(1,076,000)		(1,076,000)							(1,076,000)
Restricted Awards Granted or Vested (in shares)					1,838,000
Restricted awards granted or vested	0				$ (2,000)			(2,000)
Shares acquired and cancelled (in shares)					(1,181,000)	(2,585,000)
Shares acquired and cancelled	(8,263,000)	$ (17,866,000)	(8,263,000)	$ (17,866,000)	$ (1,000)	$ (3,000)		(8,262,000)	$ (17,863,000)
Stock-based compensation	7,392,000		7,392,000					7,392,000
Other	(1,966,000)		(640,000)							(640,000)		(1,326,000)
Balance (in shares) at Mar. 31, 2023					129,796,000		160,909,000
Balance at Mar. 31, 2023	918,933,000		487,094,000		$ 130,000		$ 2,000	469,891,000		$ 30,324,000	$ (13,253,000)	431,839,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest												(2,917,000)
Stockholders' Equity - Change in Ownership of Class C Holders	$ 0		$ (3,273,000)					$ 3,273,000				$ 3,273,000