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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Noncontrolling Interest [Line Items]            
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest   $ 21,573 $ 9,320 $ 55,110 $ 11,943  
Nonredeemable Noncontrolling Interest   534,476   534,476   $ 508,287
Adjustments to Additional Paid in Capital, Changes due to Business Combinations $ (771) 0 9,679 (1,000) 9,679  
Net Income Loss Including Transfer from Non Controlling Interests   10,609 7,608 32,747 29,878  
Stagwell Inc. Shareholders' Equity            
Noncontrolling Interest [Line Items]            
Adjustments to Additional Paid in Capital, Changes due to Business Combinations $ 9,679 0 9,679 (1,000) 9,679  
Stagwell Global            
Noncontrolling Interest [Line Items]            
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest   2,287 7,210 4,083 9,833  
Nonredeemable Noncontrolling Interest   31,564   31,564   32,914
Stagwell Media            
Noncontrolling Interest [Line Items]            
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest   19,286 $ 2,110 51,027 $ 2,110  
Nonredeemable Noncontrolling Interest   $ 502,912   $ 502,912   $ 475,373