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Investments (Summarized Balance Sheet) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Current assets $ 1,048.2 $ 1,186.7
Current liabilities 1,897.8 1,692.9
Equity Method Investees    
Schedule of Equity Method Investments [Line Items]    
Current assets 110.1 135.2
Non-current assets 91.1 177.7
Current liabilities 208.6 201.1
Non-current liabilities $ 59.8 $ 91.7