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Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 140.9
Property and equipment, net		$ 155.3
Depreciation expense	45.6	50.8	$ 48.8
Distribution Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		29.1
Property and equipment, gross	29.7
Satellite transponders accounted for under finance leases	9.5
Accumulated depreciation for satellite transponders and building accounted for under finance leases	7.7
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross		50.4
Property and equipment, gross	50.4
Less accumulated depreciation and amortization		(3.5)
Accumulated depreciation for satellite transponders and building accounted for under finance leases	4.9
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross		43.2
Property and equipment, gross	43.4
Property and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		25.5
Property and equipment, gross	25.9
Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross		132.9
Property and equipment, gross	162.4
Depreciable Assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross		281.1
Property and equipment, gross	311.8
Less accumulated depreciation and amortization		(127.0)
Less accumulated depreciation and amortization	(172.1)
Property and equipment, net	139.7
Property and equipment, net		154.1
Land
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 1.2
Property and equipment, net		1.2
Distribution Equipment Held Under Finance Lease
Property, Plant and Equipment [Line Items]
Property and equipment, gross		9.5
Less accumulated depreciation and amortization		$ (6.2)

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Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization

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