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Investments (Summarized Balance Sheet) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 138.3 $ 189.8
Non-current assets 162.0 55.7
Current liabilities 167.3 167.8
Non-current liabilities $ 102.2 $ 46.7