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Income Taxes - Components of Pretax Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Income Tax Disclosure [Abstract]      
United States $ (210.4) $ (925.9) $ (1,344.8)
International (13.5) (7.6) (9.4)
Loss from continuing operations before income taxes $ (223.9) $ (933.5) $ (1,354.2)