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Debt (Interest Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Debt Disclosure [Abstract] |  |  |  |  |
Cash interest |  | $ 44.3 | $ 35.8 | $ 89.5 | $ 68.2
Amortization of debt financing costs |  | 3.7 | 3.0 | 7.5 | 6.0
Interest expense, before interest on dissenting shareholders' liability | [1] | 48.0 | 38.8 | 97.0 | 74.2
Interest on dissenting shareholders' liability | [2] | 0.0 | 16.7 | 0.0 | 32.6
Total interest expense |  | $ 48.0 | $ 55.5 | $ 97.0 | $ 106.8
[1] | Represents interest expense before interest on dissenting shareholders' liability.
[2] | Represents interest accrued in connection with the previously outstanding dissenting shareholders' liability associated with the Starz merger.

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