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Additional Financial Information - Summary of Cash and Cash Equivalents and Cash in Assets of Discontinued Operations (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |
Cash and cash equivalents | $ 186.2 | $ 277.0 | $ 210.9
Starz Business of Lions Gate Entertainment Corp |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Cash and cash equivalents | 14.2 | 23.0 | 52.0
Cash in assets of discontinued operations - current | 0.0 | 14.0 | 9.6
Total cash, cash equivalents and cash in assets of discontinued operations | $ 14.2 | $ 37.0 | $ 61.6

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