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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
		May 11, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Gain on sale of EPIX	[1]		$ 0.0	$ 0.0	$ 0.0	$ 201.0
Investment in equity method investee					39.6	$ 47.6
Pop
Schedule of Equity Method Investments [Line Items]
Investment in equity method investee			$ 4.0		$ 9.0
Equity method investment, ownership percentage			50.00%	50.00%	50.00%	50.00%
Equity method investments			$ 95.7		$ 95.7		$ 91.3
Redeemable Preferred Stock | Pop
Schedule of Equity Method Investments [Line Items]
Rate of dividend on preferred stock					10.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations | EPIX
Schedule of Equity Method Investments [Line Items]
Ownership interest sold		31.15%
Gain on sale of EPIX						$ 201.0
Minimum
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			11.00%		11.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			50.00%		50.00%
[1] In May 2017, the Company sold all of its 31.15% equity interest in EPIX, and recorded a gain before income taxes of approximately $201.0 million. Prior to the sale of its interest in EPIX, the Company had accounted for such interest as an equity method investment.

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