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Property and Equipment (Summary) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 89.5	$ 81.2
Depreciation expense	40.1	43.0	$ 44.0
Distribution Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	19.1	18.8
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	58.7	43.5
Property and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23.8	25.3
Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	241.6	219.7
Depreciable Assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross	343.2	307.3
Less accumulated depreciation and amortization	(254.9)	(227.3)
Property and equipment, net	88.3	80.0
Land
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 1.2	$ 1.2