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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.