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Debt (Schedule of Interest Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Debt Disclosure [Abstract] |  |  |  |
Cash interest |  | $ 152.0 | $ 122.9 | $ 86.8
Amortization of debt discount and financing costs |  | 11.6 | 14.3 | 12.9
Interest expense, before interest on dissenting shareholders' liability | [1] | 163.6 | 137.2 | 99.7
Interest on dissenting shareholders' liability |  | 35.3 | 56.5 | 15.5
Total interest expense |  | $ 198.9 | $ 193.7 | $ 115.2
[1] | Represents interest expense before interest on dissenting shareholders' liability.

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