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Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for Adoption of ASC 606 (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Revenues: |  |  |  |  |
Revenues | $ 3,453,000,000 | $ 3,652,900,000 | $ 6,837,000,000 | $ 7,144,100,000 |
Cost of Sales: |  |  |  |  |
Cost of Sales | (2,913,900,000) | (3,084,000,000) | (5,761,700,000) | (6,021,600,000) |
Operating income (loss) | 107,700,000 | 78,300,000 | 214,400,000 | 184,700,000 |
Assets: |  |  |  |  |
Receivables, net | 441,200,000 |  | 441,200,000 |  | $ 528,100,000
Liabilities: |  |  |  |  |
Other accrued liabilities | 362,200,000 |  | 362,200,000 |  | 370,200,000
Stockholders' Equity: |  |  |  |  |
Retained Earnings (Accumulated Deficit) | 1,301,400,000 |  | 1,301,400,000 |  | 1,238,600,000
Parts, service and collision repair |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 444,100,000 | 443,700,000 | 890,800,000 | 874,200,000 |
Cost of Sales: |  |  |  |  |
Cost of Sales | (220,500,000) | (223,300,000) | (443,400,000) | (440,900,000) |
Finance, insurance and other, net |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 172,600,000 | $ 175,300,000 | 341,600,000 | $ 344,000,000.0 |
ASU 2014-09 | Finance, insurance and other, net |  |  |  |  |
Assets: |  |  |  |  |
Contract assets | $ 2,600,000 |  | $ 2,600,000 |  | $ 31,800,000

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