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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Revenues:          
Revenues $ 3,643,500,000 $ 3,448,100,000 $ 10,787,600,000 $ 10,410,500,000  
Cost of Sales:          
Cost of Sales (3,061,300,000) (2,867,400,000) (9,083,000,000) (8,669,600,000)  
Operating income (loss) 137,400,000 148,900,000 322,100,000 458,100,000  
Assets:          
Receivables, net 431,500,000   431,500,000   $ 462,400,000
Liabilities:          
Other accrued liabilities 376,300,000   376,300,000   352,400,000
Stockholders' Equity:          
Retained Earnings (Accumulated Deficit) 1,210,100,000   1,210,100,000   1,100,300,000
Parts, service and collision repair          
Revenues:          
Revenues 453,400,000 408,200,000 1,327,600,000 1,188,600,000  
Cost of Sales:          
Cost of Sales (228,100,000) (205,400,000) (669,000,000.0) (600,200,000)  
Finance, insurance and other, net          
Revenues:          
Revenues 173,700,000 $ 165,600,000 517,700,000 $ 505,300,000  
ASU 2014-09 | Finance, insurance and other, net          
Assets:          
Contract assets $ 27,900,000   $ 27,900,000   $ 38,700,000