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Additional Financial Information (Non-cash Investing Activities) (Details) - Starz - USD ($) $ in Millions | 9 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Noncash or Part Noncash Acquisitions [Line Items] |  |
Issuance of common shares related to Starz Merger | $ 0.0 | $ 1,284.0
Accrued purchase consideration for dissenting shareholders | 0.0 | 886.3
Issuance of Starz share-based payment replacement awards | $ 0.0 | $ 186.5

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