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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | $ 1,034 |  | $ 21,573 | $ 6,463 | $ 55,110 |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | 1,430 | $ (8,135) | 3,092 | 2,085 | 4,558 |
Income attributable to noncontrolling interests | 2,464 |  | 24,665 | (8,548) | 59,668 |
Nonredeemable Noncontrolling Interest | 423,437 |  |  | 423,437 |  | $ 462,097
Stagwell Global |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | 1,001 |  | 2,287 | 1,221 | 4,083 |
Income attributable to noncontrolling interests | (2,431) |  | 5,379 | 864 | 8,641 |
Nonredeemable Noncontrolling Interest | 29,674 |  |  | 29,674 |  | 33,691
Stagwell Media |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | 33 |  | 19,286 | (7,684) | 51,027 |
Income attributable to noncontrolling interests | (33) |  | $ 19,286 | 7,684 | $ 51,027 |
Nonredeemable Noncontrolling Interest | $ 393,763 |  |  | $ 393,763 |  | $ 428,406

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