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Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Plant, property and equipment, depreciable, gross	$ 295.1	$ 248.8
Less accumulated depreciation and amortization	141.0	88.3
Property and equipment, depreciable, net	154.1	160.5
Property and equipment, net	155.3	161.7
Depreciation expense	50.8	48.8	$ 24.4
Distribution Equipment
Property, Plant and Equipment [Line Items]
Plant, property and equipment, depreciable, gross	29.1	30.4
Building
Property, Plant and Equipment [Line Items]
Plant, property and equipment, depreciable, gross	50.4	50.4
Less accumulated depreciation and amortization	3.5	2.6
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Plant, property and equipment, depreciable, gross	43.2	29.7
Property and Equipment
Property, Plant and Equipment [Line Items]
Plant, property and equipment, depreciable, gross	25.6	21.1
Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Plant, property and equipment, depreciable, gross	146.8	117.2
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1.2	1.2
Distribution Equipment Held Under Capital Lease
Property, Plant and Equipment [Line Items]
Plant, property and equipment, depreciable, gross	9.5	16.8
Less accumulated depreciation and amortization	$ 6.2	$ 7.1

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Plant, Property and Equipment, Depreciable, Gross

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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