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Mergers and Acquisitions (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Dec. 08, 2016
Business Acquisition [Line Items]
Accrued merger consideration payable	$ 840.1	$ 812.9
Interest Rate, Percentage Spread on Federal Reserve Discount Rate	5.00%
Goodwill	$ 2,710.5	$ 2,700.5
Starz
Business Acquisition [Line Items]
Goodwill			$ 2,175.7
Starz Dissenting Shareholders | Starz
Business Acquisition [Line Items]
Outstanding equity interests (in shares)			25,000,000
Period for demanding appraisal rights	60 days
Shareholders withdrawing demands of appraisal rights (in shares)	2,510,485
Accrued merger consideration payable	$ 840.1		$ 797.3

X

- Definition

Days after the effective date of a merger, in which any shareholder who has not commenced an appraisal proceeding or joined the proceeding as a named party shall have the right to withdraw such stockholder's demand for appraisal and to accept the terms offered upon the merger.

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Business Combination, Consideration Transferred, Liabilities Accrued

+ References

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- Definition

Business Combination, Shares Withdrawn from Demanding Appraisal Rights

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- Definition

Percentage added to the Federal Reserve discount rate used to compute accrued interest on merger consideration related to dissenting shareholders.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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