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Mergers and Acquisitions (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Dec. 08, 2016
Business Acquisition [Line Items] |  |  |
Accrued merger consideration payable | $ 840.1 | $ 812.9 |
Interest Rate, Percentage Spread on Federal Reserve Discount Rate | 5.00% |  |
Goodwill | $ 2,710.5 | $ 2,700.5 |
Starz |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill |  |  | $ 2,175.7
Starz Dissenting Shareholders | Starz |  |  |
Business Acquisition [Line Items] |  |  |
Outstanding equity interests (in shares) |  |  | 25,000,000
Period for demanding appraisal rights | 60 days |  |
Shareholders withdrawing demands of appraisal rights (in shares) | 2,510,485 |  |
Accrued merger consideration payable | $ 840.1 |  | $ 797.3

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