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Investments (Summarized Balance Sheet) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Current assets $ 1,004.2 $ 1,308.1
Current liabilities 1,414.2 1,507.7
Equity Method Investees    
Schedule of Equity Method Investments [Line Items]    
Current assets 146.6 138.3
Non-current assets 188.0 162.0
Current liabilities 180.6 167.3
Non-current liabilities $ 104.6 $ 102.2