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Investments (Carrying Amount Of Equity Method Investments) (Details) - USD ($) $ in Millions		Dec. 31, 2017	May 11, 2017	Mar. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 136.8		$ 322.9
EPIX
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			31.15%		31.15%
Equity method investments	[1]	$ 0.0		188.8
Pop
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		50.00%
Equity method investments		$ 96.4		96.8
Other
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 40.4		$ 37.3
[1] In May 2017, the Company sold all of its 31.15% equity interest in EPIX to MGM (see further details below).

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- 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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+ 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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