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Discontinued Operations - Summary of Net Loss from Starz's Discontinued Operations (Parenthetical) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Other asset impairment charges | $ 25.8 | $ 0.0 |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |
Content impairment loss | 2.5 | 137.8 | $ 160.8 | $ 313.1 | $ 3.9
Other asset impairment charges | $ 7.1 | 3.8 | 5.4 |  |
Goodwill impairment |  | $ 494.0 | $ 494.0 | 1,475.0 |
Starz Business of Lions Gate Entertainment Corp | Lionsgate Plus Reporting Unit |  |  |  |  |
Goodwill impairment |  |  |  | $ 213.3 |

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