Long-Lived Assets - Property And Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property and Equipment, Net [Line Items]
Property and equipment	$ 1,966.9	$ 1,746.2
Less accumulated depreciation	(943.7)	(821.4)
Property and equipment, net	1,023.2	924.8
Land
Property and Equipment, Net [Line Items]
Property and equipment	41.8	36.3
Buildings and improvements
Property and Equipment, Net [Line Items]
Property and equipment	423.7	323.1
Automated distribution and warehouse equipment
Property and Equipment, Net [Line Items]
Property and equipment	244.5	229.1
Shelving, industrial vending, and equipment
Property and Equipment, Net [Line Items]
Property and equipment	1,036.2	927.6
Transportation equipment
Property and Equipment, Net [Line Items]
Property and equipment	88.7	77.9
Construction in progress
Property and Equipment, Net [Line Items]
Property and equipment	$ 132.0	$ 152.2
Minimum | Buildings and improvements
Property and Equipment, Net [Line Items]
Depreciable life in years	15 years
Minimum | Automated distribution and warehouse equipment
Property and Equipment, Net [Line Items]
Depreciable life in years	5 years
Minimum | Shelving, industrial vending, and equipment
Property and Equipment, Net [Line Items]
Depreciable life in years	3 years
Minimum | Transportation equipment
Property and Equipment, Net [Line Items]
Depreciable life in years	3 years
Maximum | Buildings and improvements
Property and Equipment, Net [Line Items]
Depreciable life in years	40 years
Maximum | Automated distribution and warehouse equipment
Property and Equipment, Net [Line Items]
Depreciable life in years	30 years
Maximum | Shelving, industrial vending, and equipment
Property and Equipment, Net [Line Items]
Depreciable life in years	10 years
Maximum | Transportation equipment
Property and Equipment, Net [Line Items]
Depreciable life in years	5 years