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Debt (Interest Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Debt Disclosure [Abstract] |  |  |  |
Cash interest | $ 28.3 | $ 24.0 | $ 94.7 | $ 50.4
Amortization of debt discount and financing costs | 3.6 | 3.4 | 11.0 | 8.1
Interest expense, before interest on dissenting shareholders' liability | 31.9 | 27.4 | 105.7 | 58.5
Interest on dissenting shareholders' liability | 14.4 | 0.0 | 41.6 | 0.0
Total interest expense | $ 46.3 | $ 27.4 | $ 147.3 | $ 58.5

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