Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for Adoption of ASC 606 (Details)

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Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for Adoption of ASC 606 (Details) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Revenues:      
Revenues $ 3,384,000,000 $ 3,491,200,000  
Cost of Sales:      
Cost of Sales (2,847,800,000) (2,937,700,000)  
Operating income (loss) 106,700,000 106,400,000  
Assets:      
Receivables, net 420,600,000   $ 528,100,000
Liabilities:      
Other accrued liabilities 388,400,000   370,200,000
Stockholders' Equity:      
Retained Earnings (Accumulated Deficit) 1,270,400,000   1,238,600,000
Parts, service and collision repair      
Revenues:      
Revenues 446,700,000 430,500,000  
Cost of Sales:      
Cost of Sales (222,800,000) (217,600,000)  
Finance, insurance and other, net      
Revenues:      
Revenues 169,000,000.0 $ 168,600,000  
ASU 2014-09 | Finance, insurance and other, net      
Assets:      
Contract assets $ 3,700,000   $ 31,800,000