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Investments (Summarized Statement of Operations) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Net loss $ (2,018.8) $ (205.4) $ (34.5)
Equity method investees      
Schedule of Equity Method Investments [Line Items]      
Revenues 185.3 86.0 84.6
Gross profit 35.1 26.5 32.0
Net loss $ (39.0) $ (46.1) $ (62.6)