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Commitments and Contingencies - Litigation (Details) $ in Millions		12 Months Ended
	Oct. 08, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jun. 22, 2021 lawsuit	Dec. 31, 2020 USD ($)	Aug. 06, 2019 lawsuit
Commitments and Contingencies
Letters of Credit Outstanding, Amount		$ 16.4		$ 17.7
Surety bonds outstanding		19.1		16.1
Floor Plan Facility
Commitments and Contingencies
Letters of Credit Outstanding, Amount		11.5		11.7
Senior Secured Credit Facilities
Commitments and Contingencies
Letters of Credit Outstanding, Amount		4.9		$ 5.9
U S District Court of Delaware Cases
Commitments and Contingencies
Number of lawsuits \| lawsuit					2
Class Action and the PAGA Action
Commitments and Contingencies
Reserve for estimated losses		$ 4.0
Weissmann
Commitments and Contingencies
Number of lawsuits \| lawsuit			1
Minimum \| Weissmann
Commitments and Contingencies
Damages sought by plaintiff	$ 2.5
Maximum
Commitments and Contingencies
Period for severance pay beyond termination date		1 year