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Investments (Loss on Investments) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Equity Method Investments, and Investments in Debt and Equity Securities [Abstract]        
Impairments of investments [1] $ 0.0 $ (2.6) $ 0.0 $ (36.8)
Unrealized losses on equity securities held as of period end 0.0 (3.6) (0.3) (6.4)
Loss on Investments $ 0.0 $ (6.2) $ (0.3) (43.2)
Impairments of investments in equity securities without readily determinable fair values       $ 34.2
[1]
In the three and nine months ended December 31, 2018, amounts represent impairments of equity method investments, and the nine months ended December 31, 2018 also includes other-than-temporary impairments of $34.2 million on investments in equity securities without readily determinable fair values and notes receivable (previously included in other assets), which were written down to their estimated fair value.