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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Revenues:          
Revenues $ 3,652,800,000 $ 3,352,200,000 $ 7,239,400,000 $ 6,139,000,000  
Cost of Sales:          
Cost of Sales (3,064,000,000) (2,841,400,000) (6,079,300,000) (5,227,300,000)  
Operating income (loss) 154,800,000 165,400,000 309,200,000 253,300,000  
Assets:          
Receivables, net 345,900,000   345,900,000   $ 401,100,000
Liabilities:          
Other accrued liabilities 350,200,000   350,200,000   350,500,000
Stockholders' Equity:          
Retained Earnings (Accumulated Deficit) 1,223,500,000   1,223,500,000   1,051,700,000
Parts, service and collision repair          
Revenues:          
Revenues 398,100,000 346,100,000 778,700,000 654,200,000  
Cost of Sales:          
Cost of Sales (200,000,000.0) (170,500,000) (393,900,000) (323,400,000)  
Finance, insurance and other, net          
Revenues:          
Revenues 173,200,000 $ 177,200,000 339,700,000 $ 321,900,000  
ASU 2014-09 | Finance, insurance and other, net          
Assets:          
Contract assets $ 27,600,000   $ 27,600,000   $ 34,900,000