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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended		30 Months Ended	87 Months Ended	108 Months Ended
	May 11, 2017	May 11, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2010	Dec. 31, 2017	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Investment in equity method investee					$ 47.6	$ 13.2
Proceeds from the sale of equity method investees					393.7	0.0
Distribution from equity method investee					0.0	14.0
Gain on sale of equity interest in EPIX			$ 0.0	$ 0.0	$ 201.0	$ 0.0
EPIX
Schedule of Equity Method Investments [Line Items]
Investment in equity method investee							$ 80.4	$ 0.0
Equity method investment distributions received									$ 42.0
Equity method investment, ownership percentage	31.15%	31.15%		31.15%		31.15%
Pop
Schedule of Equity Method Investments [Line Items]
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%
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]
Equity method investment, ownership percentage			17.00%		17.00%			17.00%
Playco
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			41.30%		41.30%			41.30%
Laugh Out Loud
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			50.00%		50.00%			50.00%
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
Disposal Group, Disposed of by Sale, Not Discontinued Operations | EPIX
Schedule of Equity Method Investments [Line Items]
Ownership interest sold	100.00%
Proceeds from the sale of equity method investees	$ 397.2
Gain on sale of equity interest in EPIX					$ 201.0
Lions Gate | Disposal Group, Disposed of by Sale, Not Discontinued Operations | EPIX
Schedule of Equity Method Investments [Line Items]
Ownership interest sold	31.15%
Proceeds from the sale of equity method investees	$ 373.8
Distribution from equity method investee		$ 23.4

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