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Floorplan Notes Payable - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) financial_institution	Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Outstanding letters of credit	$ 23,600,000	$ 25,400,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	1,800,000,000
Unamortized discount	4,700,000
Restrictions limit	152,000,000.0
Floorplan Line
Line of Credit Facility [Line Items]
Maximum borrowing capacity	1,750,000,000
Outstanding balance	$ 1,100,000,000
Number of financial institutions | financial_institution	23
Commitment fee (as a percentage)	0.15%
Weighted average interest rate (as a percentage)	2.70%
FMCC facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 300,000,000.0
Interest rate (as a percentage)	6.30%
Acquisition Line
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 360,000,000.0
Outstanding balance	72,500,000	$ 31,800,000
Minimum borrowing capacity	50,000,000.0
Sub-limit for letters of credit	$ 100,000,000
Interest rate (as a percentage)	1.95%
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	$ 255,400,000
UK Credit Facilities
Line of Credit Facility [Line Items]
Outstanding balance	$ 125,800,000
UK Credit Facilities | Minimum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	1.40%
UK Credit Facilities | Maximum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	4.30%
Rental Vehicles Financed through Credit Facility
Line of Credit Facility [Line Items]
Outstanding balance	$ 113,900,000
Rental Vehicles Financed through Credit Facility | Minimum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	2.70%
Rental Vehicles Financed through Credit Facility | Maximum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	6.30%
Brazilian Credit Facility
Line of Credit Facility [Line Items]
Outstanding balance	$ 15,600,000
Brazilian Credit Facility | Minimum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	4.90%
Brazilian Credit Facility | Maximum
Line of Credit Facility [Line Items]
Interest rate (as a percentage)	14.00%
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%
5.00% Senior Note
Line of Credit Facility [Line Items]
Interest rate	5.00%
5.25% Senior Note
Line of Credit Facility [Line Items]
Interest rate	5.25%

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