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Investments (Summarized Balance Sheet) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Current assets $ 126.6 $ 189.8
Non-current assets 66.1 55.7
Current liabilities 142.6 167.8
Non-current liabilities $ 44.6 $ 46.7