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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Noncontrolling Interest [Line Items] |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | $ 10,640 | $ 1,034 | $ (8,654) | $ (1,480) |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | (47) | 1,430 | 1,519 | (2,085) | $ 634
Income attributable to noncontrolling interests | 10,593 | 2,464 | 10,173 | (3,565) |
Nonredeemable Noncontrolling Interest | 457,860 |  | 457,860 |  | 468,577
Stagwell Global |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | 1,208 | 1,001 | 2,804 | 1,222 |
Income attributable to noncontrolling interests | (1,161) | 2,431 | (4,323) | (863) |
Nonredeemable Noncontrolling Interest | 22,971 |  | 22,971 |  | 32,362
Stagwell Media |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | 9,432 | 33 | 5,850 | (2,702) |
Income attributable to noncontrolling interests | (9,432) | $ 33 | (5,850) | $ (2,702) |
Nonredeemable Noncontrolling Interest | $ 434,889 |  | $ 434,889 |  | $ 436,215

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