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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Revenues:          
Revenues $ 3,652,900,000 $ 3,506,200,000 $ 7,144,100,000 $ 6,962,400,000  
Cost of Sales:          
Cost of Sales (3,084,000,000) (2,917,400,000) (6,021,600,000) (5,802,300,000)  
Operating income (loss) 78,300,000 154,800,000 184,700,000 309,200,000  
Assets:          
Receivables, net 400,600,000   400,600,000   $ 462,400,000
Liabilities:          
Other accrued liabilities 355,000,000.0   355,000,000.0   352,400,000
Stockholders' Equity:          
Retained Earnings (Accumulated Deficit) 1,151,200,000   1,151,200,000   1,100,300,000
Parts, service and collision repair          
Revenues:          
Revenues 443,700,000 399,200,000 874,200,000 780,500,000  
Cost of Sales:          
Cost of Sales (223,300,000) (200,600,000) (440,900,000) (394,900,000)  
Finance, insurance and other, net          
Revenues:          
Revenues 175,300,000 $ 173,200,000 344,000,000.0 $ 339,700,000  
ASU 2014-09 | Finance, insurance and other, net          
Assets:          
Contract assets $ 27,000,000   $ 27,000,000   $ 38,700,000