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Investments (Summarized Statement of Operations) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]      
Net loss $ (205.4) $ (34.5) $ (206.4)
Equity method investees      
Schedule of Equity Method Investments [Line Items]      
Revenues 86.0 84.6 131.9
Gross profit 26.5 32.0 51.1
Net loss $ (46.1) $ (62.6) $ (64.4)