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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	May 11, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Gain on sale of EPIX		$ 0.0	$ 0.0	$ 0.0	$ 201.0
Investment in equity method investee				16.2	$ 29.3
Pop
Schedule of Equity Method Investments [Line Items]
Investment in equity method investee		$ 5.0		$ 5.0
Equity method investment, ownership percentage		50.00%	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	31.15%
Gain on sale of EPIX					$ 201.0
Minimum
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		9.00%		9.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		50.00%		50.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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