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Segment Information - Additional Information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) Segment | Jun. 30, 2023 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of operating segments | Segment |  |  | 3 |
Impairment charges | $ 1,400,000 | $ 62,600,000 | $ (2,400,000) | $ 62,600,000
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,453,000,000 | 3,652,900,000 | 6,837,000,000 | 7,144,100,000
Retail New Vehicles [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,552,600,000 | 1,608,200,000 | 3,008,400,000 | 3,051,000,000
Fleet New Vehicles [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 26,200,000 | 28,300,000 | 45,800,000 | 47,100,000
New vehicles |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,578,800,000 | 1,636,500,000 | 3,054,200,000 | 3,098,100,000
Used vehicles |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,186,200,000 | 1,305,900,000 | 2,401,800,000 | 2,650,800,000
Wholesale vehicles |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 71,300,000 | 91,500,000 | 148,600,000 | 177,000,000.0
Total vehicles |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,836,300,000 | 3,033,900,000 | 5,604,600,000 | 5,925,900,000
Parts, service and collision repair |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 444,100,000 | 443,700,000 | 890,800,000 | 874,200,000
Finance, insurance and other, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 172,600,000 | $ 175,300,000 | $ 341,600,000 | $ 344,000,000.0

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-4 + Details
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