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 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