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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Noncontrolling Interest [Line Items] |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  | $ (19,780) | $ 42,142 | $ 21,990
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | $ 634 | 3,005 | (634) | 8,135
Income attributable to noncontrolling interests |  | 22,785 | 41,508 | 30,125
Nonredeemable Noncontrolling Interest |  | 445,174 | 468,577 |
Stagwell Global |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  | 2,636 | 3,076 | 5,986
Income attributable to noncontrolling interests |  | (5,641) | 2,442 | 14,121
Nonredeemable Noncontrolling Interest |  | 21,746 | 32,362 |
Stagwell Media |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  | 17,144 | 39,066 | 16,004
Income attributable to noncontrolling interests |  | (17,144) | 39,066 | $ 16,004
Nonredeemable Noncontrolling Interest |  | $ 423,428 | $ 436,215 |

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