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Related Party Transactions - Schedule of Net Transfers (Parenthetical) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Transfers to parent, net | $ 35.0 |  |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Transfer from parent net cash flows provided by financing activities | 2.8 | $ 44.6 | $ 146.7 | $ 228.0 | $ 171.1
Transfer to parent company aggregate share based compensation discontinued operations | 0.3 | $ 1.0 | $ 1.8 | $ 3.0 | $ 1.9
Starz Business of Lions Gate Entertainment Corp | Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Transfers to parent, net | $ 35.0 |  |  |  |

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