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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

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