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Income Taxes - Summary Of Components Of Pretax Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Schedule Of Income Before Income Tax Domestic And Foreign [Line Items] |  |  |
United States | $ (143.8) | $ (33.5) | $ 20.4
International | 71.1 | 38.9 | (9.2)
Pre Income Tax Expense Benefit | (72.7) | 5.4 | 11.2
Starz Business of Lions Gate Entertainment Corp |  |  |
Schedule Of Income Before Income Tax Domestic And Foreign [Line Items] |  |  |
United States | (925.9) | (1,344.8) | (8.7)
International | (7.6) | (9.4) | (14.2)
Pre Income Tax Expense Benefit | $ (933.5) | $ (1,354.2) | $ (22.9)

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