Inventories and Related Notes Payable - Floor Plan - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Average interest rate for new vehicle floor plan facilities	0.74%	1.72%	3.03%
Amount recognized for floor plan assistance	$ 46.5	$ 40.6	$ 41.5
Average interest rate for used vehicle floor plan facilities	1.75%	2.02%	3.10%