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Investments (Summarized Balance Sheet) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Current assets $ 853.3 $ 1,186.7
Current liabilities 1,555.6 1,692.9
Equity Method Investees    
Schedule of Equity Method Investments [Line Items]    
Current assets 106.8 135.2
Non-current assets 78.4 177.7
Current liabilities 208.9 201.1
Non-current liabilities $ 59.6 $ 91.7