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Additional Financial Information (Non-cash Investing Activities) (Details) - Starz - USD ($) $ in Millions	9 Months Ended
	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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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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-SubTopic 10
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