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Investments (Summarized Balance Sheet) (Details) - Other Equity Method Investments - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]    
Current assets $ 189.8 $ 232.7
Non-current assets 55.7 130.0
Current liabilities 167.8 201.5
Non-current liabilities $ 46.7 $ 45.0