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Investments (Available-for-sale Narrative) (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Dec. 08, 2016	Mar. 27, 2015	Jul. 31, 2014	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost basis				$ 2.6	$ 158.9
Gain recognized on Starz available-for-sale securities				20.4	$ 0.0	$ 0.0
Next Games
Schedule of Available-for-sale Securities [Line Items]
Payments to acquire cost method investments			$ 2.0
Starz
Schedule of Available-for-sale Securities [Line Items]
Issuance of common shares related to investments (in shares)		4,967,695
Starz Series A Common Stock | Starz
Schedule of Available-for-sale Securities [Line Items]
Shares received in exchange (in shares)		2,118,038
Starz Series B Common Stock | Starz
Schedule of Available-for-sale Securities [Line Items]
Shares received in exchange (in shares)		2,590,597
Starz
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 179.3
Cost basis	$ 158.9
Gain recognized on Starz available-for-sale securities				$ 20.4

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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-Topic 805
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-Section 50
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