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Debt (Summary of Loss on Extinguishment of Debt) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Extinguishment of Debt [Line Items] |  |  |
Loss on extinguishment of debt | $ 40.4 | $ 0.0 | $ 11.7
Revolving Credit Facility |  |  |
Extinguishment of Debt [Line Items] |  |  |
Loss on extinguishment of debt | 0.6 |  | 0.0
Term Loan Due 2022 & 5.25% Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Loss on extinguishment of debt | 24.5 |  | 0.0
Starz credit facility & Starz Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Loss on extinguishment of debt | 3.2 |  | 0.0
Term Loan B Facility |  |  |
Extinguishment of Debt [Line Items] |  |  |
Loss on extinguishment of debt | 12.1 |  | 0.0
Term Loan Due 2020 |  |  |
Extinguishment of Debt [Line Items] |  |  |
Loss on extinguishment of debt | 0.0 |  | 10.4
Convertible Senior Subordinated Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Loss on extinguishment of debt | $ 0.0 |  | $ 1.3

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