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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Revenues:          
Revenues $ 3,491,500,000 $ 3,643,500,000 $ 10,328,500,000 $ 10,787,600,000  
Cost of Sales:          
Cost of Sales (2,947,900,000) (3,061,300,000) (8,709,600,000) (9,083,000,000)  
Operating income (loss) 113,600,000 137,400,000 328,000,000.0 322,100,000  
Assets:          
Receivables, net 436,600,000   436,600,000   $ 528,100,000
Liabilities:          
Other accrued liabilities 400,600,000   400,600,000   370,200,000
Stockholders' Equity:          
Retained Earnings (Accumulated Deficit) 1,365,300,000   1,365,300,000   1,238,600,000
Parts, service and collision repair          
Revenues:          
Revenues 479,000,000.0 453,400,000 1,369,800,000 1,327,600,000  
Cost of Sales:          
Cost of Sales (239,100,000) (228,100,000) (682,400,000) (669,000,000.0)  
Finance, insurance and other, net          
Revenues:          
Revenues 175,600,000 $ 173,700,000 517,200,000 $ 517,700,000  
ASU 2014-09 | Finance, insurance and other, net          
Assets:          
Contract assets $ 2,200,000   $ 2,200,000   $ 31,800,000