Long-Lived Assets - Property And Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property and Equipment, Net [Line Items]
Property and equipment	$ 2,084.6	$ 1,966.9
Less accumulated depreciation	(1,053.9)	(943.7)
Property and equipment, net	1,030.7	1,023.2
Land
Property and Equipment, Net [Line Items]
Property and equipment	51.9	41.8
Buildings and improvements
Property and Equipment, Net [Line Items]
Property and equipment	450.4	423.7
Automated distribution and warehouse equipment
Property and Equipment, Net [Line Items]
Property and equipment	254.7	244.5
Shelving, industrial vending, and equipment
Property and Equipment, Net [Line Items]
Property and equipment	1,141.3	1,036.2
Transportation equipment
Property and Equipment, Net [Line Items]
Property and equipment	87.3	88.7
Construction in progress
Property and Equipment, Net [Line Items]
Property and equipment	$ 99.0	$ 132.0
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