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Segment Information (Reconciliation of Segment General and Administration to Consolidated) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment general and administrative expenses		$ 61.4	$ 36.1	$ 123.1	$ 71.0
General and administration		111.5	73.8	223.3	144.8
Operating segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment general and administrative expenses		61.4	36.1	123.1	71.0
Corporate general and administrative expense
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate general and administrative expenses		25.3	21.5	50.7	42.8
Corporate and reconciling items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Purchase accounting and related adjustments	[1]	41.8	5.4	88.8	11.8
General and administrative expense
Segment Reporting, Other Significant Reconciling Item [Line Items]
Purchase accounting and related adjustments		1.6	1.3	3.0	2.5
General and administrative expense | Corporate and reconciling items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Share-based compensation expense included in general and administrative expense		23.2	14.9	46.5	28.5
Purchase accounting and related adjustments		$ 1.6	$ 1.3	$ 2.9	$ 2.5
[1] Purchase accounting and related adjustments represent the amortization of non-cash fair value adjustments to certain assets acquired in the acquisition of Starz and Pilgrim Media Group. The following sets forth the amounts included in each line item in the financial statements:

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General and administrative expenses for corporate and shared services not otherwise specifically identified in the reporting period.

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- Definition

The amortization of non-cash fair value adjustments to the assets and liabilities acquired in the acquisition of businesses.

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Segment general and administration.

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- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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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