Summary of Significant Accounting Policies - Revenue Recognition, Vendor Rebates and Promotional Allowances, and Excise Taxes (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) geographicArea	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Management service fee revenue as a percentage of total net sales, less than 1%									1.00%	1.00%	1.00%
Number of geographic areas | geographicArea									2
Vendor rebates and promotional allowances									$ 236.5	$ 254.7	$ 237.7
Excise taxes	$ 824.8	$ 888.3	$ 857.4	$ 770.3	$ 819.7	$ 884.1	$ 868.8	$ 768.7	$ 3,300.0	$ 3,300.0	$ 3,500.0
Excise taxes as a percentage of net sales									20.00%	20.00%	21.00%
Excise taxes as a percentage of cost of goods sold									21.00%	21.00%	22.00%