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Debt (Interest Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]        
Cash interest $ 39.7 $ 28.3 $ 107.9 $ 94.7
Amortization of debt discount and financing costs 3.0 3.6 9.0 11.0
Interest expense, before interest on dissenting shareholders' liability [1] 42.7 31.9 116.9 105.7
Interest on dissenting shareholders' liability 2.6 14.4 35.3 41.6
Total interest expense $ 45.3 $ 46.3 $ 152.2 $ 147.3
[1] Represents interest expense before interest on dissenting shareholders' liability.