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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions		12 Months Ended			30 Months Ended	78 Months Ended	108 Months Ended
	May 11, 2017	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2010	Mar. 31, 2017	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Investment in equity method investee		$ 20.6	$ 16.8	$ 52.7
FEARnet
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of equity method investee				11.4
EPIX
Schedule of Equity Method Investments [Line Items]
Investment in equity method investee					$ 80.4	$ 0.0
Equity method investment distributions received		$ 14.0	$ 0.0	$ 7.8			$ 42.0
Equity method investment, ownership percentage		31.15%	31.15%	31.15%		31.15%	31.15%
Pop
Schedule of Equity Method Investments [Line Items]
Investment in equity method investee		$ 5.0	$ 8.8	$ 15.0
Ownership interest percentage after call option, partner in equity method investment		80.00%				80.00%	80.00%
Call option, period exercisable beginning March 26, 2018		30 days
Equity method investment, ownership percentage		50.00%	50.00%	50.00%		50.00%	50.00%
Defy Media
Schedule of Equity Method Investments [Line Items]
Effective economic interest in Defy Media		11.00%				11.00%	11.00%
Roadside Attractions
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		43.00%				43.00%	43.00%
Pantelion Films
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		49.00%				49.00%	49.00%
Atom Tickets
Schedule of Equity Method Investments [Line Items]
Investment in equity method investee			$ 7.9	$ 4.3
Equity method investment, ownership percentage		15.00%				15.00%	15.00%
Playco
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		41.30%				41.30%	41.30%
Redeemable Preferred Stock | Pop
Schedule of Equity Method Investments [Line Items]
Rate of dividend on preferred stock		10.00%
Total accretion period to redemption date of mandatorily redeemable preferred stock units and dividend		10 years
Disposed by sale | Subsequent Event | EPIX
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of equity method investee	$ 200.0

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