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
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Cost of Sales:      
Cost of Sales $ (2,884,900,000) $ (2,385,900,000)  
Operating income (loss) 154,400,000 87,900,000  
Assets:      
Receivables, net 351,500,000   $ 401,100,000
Liabilities:      
Other accrued liabilities 406,300,000   350,500,000
Stockholders' Equity:      
Retained Earnings (Accumulated Deficit) 1,138,900,000   1,051,700,000
Revenues 3,456,200,000 2,786,800,000  
Fleet Revenue Correction (130,400,000)    
Parts, service and collision repair      
Cost of Sales:      
Cost of Sales (193,900,000) (165,900,000)  
Stockholders' Equity:      
Revenues 380,500,000 320,900,000  
Finance, insurance and other, net      
Stockholders' Equity:      
Revenues 166,600,000 144,700,000  
Fleet New Vehicles [Member]      
Cost of Sales:      
Cost of Sales (17,400,000) (22,100,000)  
Stockholders' Equity:      
Revenues 18,200,000 22,300,000  
New vehicles      
Cost of Sales:      
Cost of Sales (1,201,000,000) (1,086,900,000)  
Stockholders' Equity:      
Revenues 1,369,500,000 1,156,300,000  
Total vehicles      
Cost of Sales:      
Cost of Sales (2,691,000,000) (2,220,000,000)  
Stockholders' Equity:      
Revenues 2,909,100,000 $ 2,321,200,000  
ASU 2014-09 | Finance, insurance and other, net      
Assets:      
Contract assets $ 24,400,000   $ 34,900,000