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Segment Information (Purchase Accounting and Related Adjustments) (Details) - Corporate and reconciling items - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments	[1]	$ 62.8	$ 9.6	$ 0.0
Direct operating
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments		17.5	6.5	0.0
General and administrative expense
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments		5.0	1.9	0.0
Depreciation and amortization expense
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments		$ 40.3	$ 1.2	$ 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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The amortization of non-cash fair value adjustments to the assets and liabilities acquired in the acquisition of businesses.

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