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Credit Facilities and Long-term Debt - Narrative (Details) $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2021 CAD ($) lineOfCredit | Aug. 01, 2021 USD ($) | May 27, 2021 USD ($) | Apr. 12, 2021 USD ($) | Jul. 14, 2020 USD ($) finance_company financialInstitution | Dec. 31, 2021 USD ($) | Nov. 30, 2021 USD ($) | Apr. 29, 2021 USD ($) finance_company financialInstitution | Dec. 31, 2020 USD ($) | Oct. 09, 2020 USD ($) | Jul. 31, 2020 USD ($) | Dec. 09, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, number of manufacturer-affiliated finance companies | finance_company |  |  |  |  | 2 |  |  |  |  |  |  |
Floor plan notes payable |  |  |  |  |  | $ 354,200,000 |  |  | $ 234,200,000 |  |  |
Non-recourse notes payable |  |  |  |  |  |  | $ 344,400,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finance lease, interest rate |  |  |  |  |  | 1.90% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finance lease, interest rate |  |  |  |  |  | 8.50% |  |  |  |  |  |
Floor Plan Notes Payable | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  |  |  |  | 4.75% |  |  |  |  |  |
Other debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt outstanding |  |  |  |  |  | $ 1,900,000 |  |  | 2,400,000 |  |  |
Other debt | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  |  |  |  | 5.00% |  |  |  |  |  |
Other debt | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  |  |  |  | 10.00% |  |  |  |  |  |
Line of Credit | Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, number of counter-parties | financialInstitution |  |  |  |  |  |  |  | 20 |  |  |  |
Debt instrument, number of manufacturer-affiliated finance companies | finance_company |  |  |  |  |  |  |  | 8 |  |  |  |
Financing commitment amount |  |  |  |  |  |  |  | $ 3,750,000,000 |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  |  |  | 4,250,000,000 |  |  |  |
Line of Credit | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments | lineOfCredit | 3 |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Bank of Nova Scotia Credit Agreement | Prime Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 0.25% |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Bank of Nova Scotia Credit Agreement | Prime Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 1.50% |  |  |  |  |  |  |  |  |  |  |
Real Estate Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percent of total mortgage debt with fixed interest rates |  |  |  |  |  | 71.20% |  |  |  |  |  |
Total long-term debt outstanding |  |  |  |  |  | $ 592,900,000 |  |  | $ 611,500,000 |  |  |
Real Estate Mortgages | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  |  |  |  | 1.80% |  |  |  |  |  |
Real Estate Mortgages | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  |  |  |  | 5.30% |  |  |  |  |  |
Senior Notes | 5.250% Senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  | 5.25% |  |  |  |  |  |  | 5.25% |  |  |
Aggregate principal amount |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |
Debt redemption price, percentage of principal amount redeemed |  | 102.625% |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 10,300,000 |  |  |  |  |  |
Total long-term debt outstanding |  |  |  |  |  | $ 0 |  |  | $ 300,000,000.0 |  |  |
Senior Notes | 3.875% Senior notes due 2029 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  | 3.875% |  |  | 3.875% |  |  |  |  |  |
Aggregate principal amount |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  |
Total long-term debt outstanding |  |  |  |  |  | $ 800,000,000.0 |  |  | 0 |  |  |
Senior Notes | 3.875% Senior notes due 2029 | Debt Redemption Scenario One |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of debt principal amount redeemed |  |  | 40.00% |  |  |  |  |  |  |  |  |
Debt redemption price, percentage of principal amount redeemed |  |  | 103.875% |  |  |  |  |  |  |  |  |
Senior Notes | 3.875% Senior notes due 2029 | Debt Redemption Scenario Two |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt redemption price, percentage of principal amount redeemed |  |  | 100.00% |  |  |  |  |  |  |  |  |
Senior Notes | 4.625% Senior notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  |  |  |  | 4.625% |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000
Total long-term debt outstanding |  |  |  |  |  | $ 400,000,000.0 |  |  | 400,000,000.0 |  |  |
Senior Notes | 4.375% Senior notes due 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  |  |  |  | 4.375% |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 550,000,000 |  |
Total long-term debt outstanding |  |  |  |  |  | $ 550,000,000.0 |  |  | 550,000,000.0 |  |  |
Used Vehicle Inventory Floorplan Financing | Line of Credit | Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |
Option to reallocate commitment, maximum aggregate commitment threshold percentage |  |  |  |  |  |  |  | 20.00% |  |  |  |
Used Vehicle Inventory Floorplan Financing | Line of Credit | Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  | 1.40% |  |  |  |  |  |
Revolving lines of credit | Ally Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | $ 0 |  |  |  |  |  |
Debt stated interest rate |  |  |  | 3.00% |  |  |  |  |  |  |  |
Revolving lines of credit | Ally Credit Facility | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  | 0.25% |  |  |  |  |  |  |  |
Revolving lines of credit | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt outstanding |  |  |  |  |  | $ 219,900,000 |  |  | $ 39,000,000.0 |  |  |
Revolving lines of credit | Line of Credit | Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |
Option to reallocate commitment, maximum aggregate commitment threshold percentage |  |  |  |  |  |  |  | 20.00% |  |  |  |
Revolving lines of credit | Line of Credit | Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  | 1.00% |  |  |  |  |  |
Revolving lines of credit | Line of Credit | Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  | 2.00% |  |  |  |  |  |
Revolving lines of credit | Line of Credit | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | $ 50 |  |  |  |  |  |  |  |  |  |  |
Service Loaner Vehicle Floorplan Financing | Line of Credit | Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |
Option to reallocate commitment, maximum aggregate commitment threshold percentage |  |  |  |  |  |  |  | 3.00% |  |  |  |
Service Loaner Vehicle Floorplan Financing | Line of Credit | Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  | 1.20% |  |  |  |  |  |
New Vehicle Inventory Floorplan Financing | Line of Credit | Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  |  |  | $ 2,150,000,000 |  |  |  |
New Vehicle Inventory Floorplan Financing | Line of Credit | Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  | 1.10% |  |  |  |  |  |
Other Lines of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  | $ 80,000,000 |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | $ 0 |  |  |  |  |  |
Other Lines of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  |  |  |  | 5.65% |  |  |  |  |  |
Real Estate Backed Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, number of counter-parties | financialInstitution |  |  |  |  | 8 |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  | $ 238,800,000 |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | $ 0 |  |  |  |  |  |
Debt term |  |  |  |  | 5 years |  |  |  |  |  |  |
Real Estate Backed Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  | 2.00% |  |  |  |  |  |  |
Real Estate Backed Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  | 2.50% |  |  |  |  |  |  |
Real Estate Backed Credit Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  | 0.75% |  |  |  |  |  |  |
Securitization Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Long-term line of credit |  |  |  |  |  | $ 90,000,000 |  |  |  |  |  |
New and Used Vehicles Inventory Floorplan Financing | Line of Credit | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | 300 |  |  |  |  |  |  |  |  |  |  |
Wholesale Lease Financing | Line of Credit | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | $ 350 |  |  |  |  |  |  |  |  |  |  |

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