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Investments (Investments by Category) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Equity Method Investments, and Investments in Debt and Equity Securities [Abstract]    
Investments in equity method investees $ 24.5 $ 127.0
Other investments 1.7 37.9
Investments $ 26.2 $ 164.9