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Segment Information - Additional Information (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) Segment | Sep. 30, 2023 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of operating segments | Segment |  |  | 3 |
Impairment charges | $ 0 | $ 0 | $ (2,400,000) | $ 62,600,000
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,491,500,000 | 3,643,500,000 | 10,328,500,000 | 10,787,600,000
Retail New Vehicles [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,566,800,000 | 1,573,500,000 | 4,575,200,000 | 4,624,400,000
Fleet New Vehicles [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 22,200,000 | 23,200,000 | 68,000,000.0 | 70,400,000
New vehicles |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,589,000,000 | 1,596,700,000 | 4,643,200,000 | 4,694,800,000
Used vehicles |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,180,700,000 | 1,340,400,000 | 3,582,500,000 | 3,991,200,000
Wholesale vehicles |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 67,200,000 | 79,300,000 | 215,800,000 | 256,300,000
Total vehicles |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,836,900,000 | 3,016,400,000 | 8,441,500,000 | 8,942,300,000
Parts, service and collision repair |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 479,000,000.0 | 453,400,000 | 1,369,800,000 | 1,327,600,000
Finance, insurance and other, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 175,600,000 | $ 173,700,000 | $ 517,200,000 | $ 517,700,000

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