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Segment Information (Reconciliation of Segment General and Administration to Consolidated) (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment general and administrative expenses		$ 182.4	$ 120.7	$ 103.4
General and administration		355.4	262.4	252.8
Operating segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment general and administrative expenses		182.4	120.7	103.4
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate general and administrative expenses		92.6	83.4	86.1
Corporate and reconciling items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Purchase accounting and related adjustments	[1]	62.8	9.6	0.0
General and administrative expense | Corporate and reconciling items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Other share-based compensation expense		75.4	56.4	63.3
Purchase accounting and related adjustments		$ 5.0	$ 1.9	$ 0.0
[1] Purchase accounting and related adjustments represent the amortization of non-cash fair value adjustments to the assets and liabilities 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: Year Ended March 31, 2017 2016 2015 (Amounts in millions)Purchase accounting and related adjustments: Direct operating$17.5 $6.5 $—General and administrative expense5.0 1.9 —Depreciation and amortization40.3 1.2 — $62.8 $9.6 $—

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

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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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