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Income Taxes (Components of Pre-Tax Income (Loss)) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]      
United States $ (246.3) $ (453.3) $ (505.7)
International 228.9 250.2 197.6
Loss before income taxes $ (17.4) $ (203.1) $ (308.1)