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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2023 | Aug. 02, 2021 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  | $ (42,142) | $ 21,990 | $ 15,296
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest |  |  |  |  |  |  |  | 634 | 8,135 | (412)
Income attributable to noncontrolling interests | $ 45,073 | $ 2,464 | $ (1,771) | $ (4,258) | $ (6,029) | $ 39,626 | $ (3,565) | 41,508 | 30,125 | 14,884
Nonredeemable Noncontrolling Interest | 468,577 |  |  |  |  |  |  | 468,577 | 430,164 |
Stagwell Global |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  | 3,076 | 5,986 | 9,170
Income attributable to noncontrolling interests |  |  |  |  |  |  |  | (2,442) | 14,121 |
Nonredeemable Noncontrolling Interest | 32,362 |  |  |  |  |  |  | 32,362 | 30,848 |
Stagwell Media |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  | 39,066 | 16,004 | $ 6,126
Income attributable to noncontrolling interests |  |  |  |  |  |  |  | (39,066) | 16,004 |
Nonredeemable Noncontrolling Interest | $ 436,215 |  |  |  |  |  |  | $ 436,215 | $ 399,316 |

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