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Debt (Schedule of Interest Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Debt Disclosure [Abstract] |  |  |
Cash interest | $ 122.9 | $ 86.8 | $ 45.7
Amortization of debt discount and financing costs | 14.3 | 12.9 | 9.2
Interest expense, before interest on dissenters' liability | 137.2 | 99.7 | 54.9
Interest on dissenting shareholders' liability | 56.5 | 15.5 | 0.0
Total interest expense | $ 193.7 | $ 115.2 | $ 54.9

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