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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Mar. 31, 2029 | Mar. 31, 2028 | Mar. 31, 2027 | Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  | $ 2.1 | $ 2.2 | $ 2.2 | $ 2.5 | $ 4.2 | $ 5.3 | $ 5.7 | $ 5.7 |
Goodwill Impairment Carrying Value |  |  |  |  |  |  |  |  | 811.2 |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated goodwill impairment losses |  |  |  |  |  |  |  |  | 1,755.7 |  |  | $ 1,755.7
Amortization of intangible assets |  |  |  | $ 108.0 | $ 113.3 | $ 118.4 | $ 125.1 | $ 134.2 | 137.0 | 134.5 | $ 129.2 |
Goodwill impairment |  |  | $ 494.0 |  |  |  |  |  | 494.0 | $ 1,475.0 |  |
Starz Business of Lions Gate Entertainment Corp | Starz Networks |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss before business combination | $ 250.0 | $ 250.0 |  |  |  |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Trade name |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 4.0 |  |  |
Goodwill impairment | 170.0 | 170.0 | 170.0 |  |  |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Trade name | Starz Networks |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Carrying Value | $ 80.0 | $ 80.0 | $ 80.0 |  |  |  |  |  |  |  |  |

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