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Investments (Summarized Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Current assets $ 155.6 $ 189.8
Non-current assets 132.9 55.7
Current liabilities 168.0 167.8
Non-current liabilities $ 117.5 $ 46.7