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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2024
Noncontrolling Interest [Line Items] |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | $ 6,635 | $ (224) |  |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | 4,227 | 793 | $ (3,005) |
Income attributable to noncontrolling interests | (2,408) | 569 |  |
Nonredeemable Noncontrolling Interest | 445,493 |  |  | $ 445,174
Stagwell Global |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | 2 | 823 |  |
Income attributable to noncontrolling interests | (4,229) | (1,616) |  |
Nonredeemable Noncontrolling Interest | 21,497 |  |  | 21,746
Stagwell Media |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | (6,637) | (1,047) |  |
Income attributable to noncontrolling interests | 6,637 | $ 1,047 |  |
Nonredeemable Noncontrolling Interest | $ 423,996 |  |  | $ 423,428

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