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Investments (Carrying Amount Of Equity Method Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 322.9	$ 297.5
EPIX
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	31.15%	31.15%	31.15%
Equity method investments	$ 188.8	$ 171.8
Pop
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%	50.00%	50.00%
Equity method investments	$ 96.8	$ 98.7
Other
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 37.3	$ 27.0

X

- Definition

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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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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+ References

No definition available.

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