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Credit Facilities and Long-term Debt - Narrative (Details) |  |  |  |  |  |  | 12 Months Ended
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Dec. 23, 2024 CAD ($) financeCompany financialInstitution | Dec. 20, 2024 USD ($) | Aug. 15, 2024 USD ($) | Jul. 09, 2024 EUR (€) | Feb. 23, 2024 USD ($) financeCompany financialInstitution | Feb. 16, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of non-recourse notes payable |  |  |  |  |  |  | $ 1,353,900,000 | $ 1,872,900,000 | $ 298,100,000
Finance lease obligations |  |  |  |  |  |  | 114,300,000 | 99,400,000 |
Nonrecourse | Collateralized Auto Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of non-recourse notes payable |  |  |  |  |  |  | $ 1,400,000,000 |  |
Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Finance lease, interest rate (as a percent) |  |  |  |  |  |  | 2.50% |  |
Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Finance lease, interest rate (as a percent) |  |  |  |  |  |  | 8.50% |  |
Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  | $ 6,000,000,000 |  |  |  |
Syndicated Credit Facility, Upon Expansion of Original Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  | 6,500,000,000 |  |  |  |
Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, number of counter-parties | financialInstitution | 6 |  |  |  |  |  |  |  |
Debt instrument, number of manufacturer-affiliated finance companies | financeCompany | 2 |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | $ 1,100,000,000 |  |  |  |  |  |  |  |
Other Debt | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt stated interest rate (as a percent) |  |  |  |  |  |  | 5.00% |  |
Other Debt | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt stated interest rate (as a percent) |  |  |  |  |  |  | 7.80% |  |
New vehicle floor plan | Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  | 2,800,000,000 |  |  |  |
Used vehicle floor plan | Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  | 900,000,000 |  |  |  |
Service loaner floor plan | Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  | $ 100,000,000 |  |  |  |
Option to reallocate commitment, maximum aggregate commitment threshold (as a percent) |  |  |  |  | 3.00% |  |  |  |
Revolving lines of credit | Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  | $ 2,200,000,000 |  |  |  |
Option to reallocate commitment, maximum aggregate commitment threshold (as a percent) |  |  |  |  | 40.00% |  |  |  |
Revolving lines of credit | Bank of America Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | € |  |  |  | € 100,000,000.0 |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 1.45% |  |  |  |  |
Revolving lines of credit | Ally Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  | $ 300,000,000 |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 0.40% |  |  |  |  |  |  |
Debt stated interest rate (as a percent) |  | 3.00% |  |  |  |  |  |  |
Working capital revolving facility | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | 125,000,000 |  |  |  |  |  |  |  |
Wholesale flooring facility | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | 500,000,000 |  |  |  |  |  |  |  |
Used vehicle flooring facility | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | 75,000,000 |  |  |  |  |  |  |  |
Wholesale leasing facility | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | 400,000,000 |  |  |  |  |  |  |  |
Daily rental facility | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | $ 25,000,000 |  |  |  |  |  |  |  |
Securitization facility | JPM Warehouse Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  | $ 1,000,000,000.0 |  |  |  |  |  |
Securitization facility | Mizuho Warehouse Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  | $ 750,000,000 |  |  |
Line of Credit | Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, number of counter-parties | financialInstitution |  |  |  |  | 21 |  |  |  |
Debt instrument, number of manufacturer-affiliated finance companies | financeCompany |  |  |  |  | 7 |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 0.10% |  |  |  |
Line of Credit | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 0.30% |  |  |  |  |  |  |  |
Line of Credit | Ally Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  | $ 0 |  |
Line of Credit | New vehicle floor plan | Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.10% |  |  |  |
Line of Credit | Used vehicle floor plan | Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.40% |  |  |  |
Line of Credit | Used vehicle floor plan | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.25% |  |  |  |  |  |  |  |
Line of Credit | Service loaner floor plan | Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.20% |  |  |  |
Line of Credit | Revolving lines of credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  | 1,633,200,000 | 1,620,700,000 |
Line of Credit | Revolving lines of credit | Syndicated Credit Facility | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.00% |  |  |  |
Line of Credit | Revolving lines of credit | Syndicated Credit Facility | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 2.00% |  |  |  |
Line of Credit | Revolving lines of credit | Bank of Nova Scotia Credit Agreement | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.25% |  |  |  |  |  |  |  |
Line of Credit | Revolving lines of credit | Bank of Nova Scotia Credit Agreement | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.25% |  |  |  |  |  |  |  |
Line of Credit | Wholesale flooring facility | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.00% |  |  |  |  |  |  |  |
Line of Credit | Wholesale leasing facility | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.30% |  |  |  |  |  |  |  |
Line of Credit | Daily rental facility | Bank of Nova Scotia Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.20% |  |  |  |  |  |  |  |
Line of Credit | Securitization facility | JPM Warehouse Facility | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 1.00% |  |  |  |  |  |
Line of Credit | Securitization facility | JPM Warehouse Facility | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 1.70% |  |  |  |  |  |
Line of Credit | Securitization facility | Mizuho Warehouse Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 1.20% |  |  |
Notes Payable | Nonrecourse |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  | $ 2,109,300,000 | $ 1,705,600,000 |
Notes Payable | Floor Plan Notes Payable | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt stated interest rate (as a percent) |  |  |  |  |  |  | 5.75% |  |
Notes Payable | Floor Plan Notes Payable | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt stated interest rate (as a percent) |  |  |  |  |  |  | 8.85% |  |
Notes Payable | Floor Plan Notes Payable Non Trade | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt stated interest rate (as a percent) |  |  |  |  |  |  | 4.62% |  |
Notes Payable | Floor Plan Notes Payable Non Trade | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt stated interest rate (as a percent) |  |  |  |  |  |  | 8.50% |  |
Mortgages |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  | $ 904,600,000 |  |
Percent of total mortgage debt with fixed interest rates (as a percent) |  |  |  |  |  |  | 64.30% |  |
Mortgages | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt stated interest rate (as a percent) |  |  |  |  |  |  | 3.00% |  |
Mortgages | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt stated interest rate (as a percent) |  |  |  |  |  |  | 8.00% |  |
Other Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  | $ 67,100,000 |  |

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