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Floorplan Notes Payable - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Sep. 02, 2020	Apr. 02, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Outstanding letters of credit	$ 17,800,000			$ 23,600,000
Unamortized discount		$ 2,600,000	$ 1,900,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	1,750,000,000
Unamortized discount	3,600,000			4,700,000
Restrictions limit	235,300,000
Floorplan Line
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 1,700,000,000
Commitment fee (as a percentage)	0.15%
Weighted average interest rate (as a percentage)	1.20%
FMCC facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 300,000,000.0
Interest rate (as a percentage)	5.50%
Acquisition Line
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 349,000,000.0
Minimum borrowing capacity	50,000,000.0
Sub-limit for letters of credit	$ 100,000,000
Interest rate (as a percentage)	1.29%
Outstanding balance	$ 47,800,000			$ 72,500,000
Acquisition Line | Minimum
Line of Credit Facility [Line Items]
Commitment fee (as a percentage)	0.15%
Acquisition Line | Maximum
Line of Credit Facility [Line Items]
Commitment fee (as a percentage)	0.40%
Other Credit Facilities
Line of Credit Facility [Line Items]
Outstanding balance	$ 232,300,000
UK Credit Facilities
Line of Credit Facility [Line Items]
Outstanding balance	$ 131,200,000
UK Credit Facilities | Minimum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	1.00%
UK Credit Facilities | Maximum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	4.00%
Rental Vehicles Financed through Credit Facility
Line of Credit Facility [Line Items]
Outstanding balance	$ 94,400,000
Rental Vehicles Financed through Credit Facility | Minimum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	1.00%
Rental Vehicles Financed through Credit Facility | Maximum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	6.00%
Brazilian Credit Facility
Line of Credit Facility [Line Items]
Outstanding balance	$ 6,700,000
Brazilian Credit Facility | Minimum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	2.00%
Brazilian Credit Facility | Maximum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	10.00%
LIBOR | Acquisition Line | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percentage)	1.00%
LIBOR | Acquisition Line | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percentage)	2.00%
LIBOR | New vehicles
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percentage)	1.10%
LIBOR | Used vehicles
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percentage)	1.40%
Prime Rate | FMCC facility
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percentage)	1.50%
4.00% Senior Notes
Line of Credit Facility [Line Items]
Interest rate	4.00%

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