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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2024
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | $ 624 | $ (1,762) | $ 6,011 | $ (1,986) |  |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | 3 | 773 | 4,230 | 1,566 | $ (3,005) |
Income attributable to noncontrolling interests | 627 | (989) | (1,781) | (420) |  |
Nonredeemable Noncontrolling Interest | 21,802 |  | 21,802 |  |  | $ 445,174
Stagwell Global |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | 624 | 773 | 626 | 1,596 |  |
Income attributable to noncontrolling interests |  | 1,546 | (4,856) | 3,162 |  |
Nonredeemable Noncontrolling Interest | 21,802 |  | 21,802 |  |  | 21,746
Stagwell Media |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | 0 | (2,535) | (6,637) | (3,582) |  |
Income attributable to noncontrolling interests |  | $ (2,535) | 6,637 | $ (3,582) |  |
Nonredeemable Noncontrolling Interest | $ 0 |  | $ 0 |  |  | $ 423,428

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