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Investments (Investments by Category) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Mar. 31, 2016
Equity Method Investments, Cost Method Investments, and Investments in Debt and Equity [Abstract]    
Equity method investments $ 322.9 $ 297.5
Available-for-sale securities 8.0 124.0
Cost method investments 40.6 42.8
Investments $ 371.5 $ 464.3