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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.

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