Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - 2016 Credit Facilities (Details)

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Long-Term Debt - 2016 Credit Facilities (Details) - USD ($)
6 Months Ended
Nov. 30, 2016
Jun. 30, 2021
Dec. 31, 2020
TwoThousandSixteenRevolvingCreditFacilityMember      
Line of Credit Facility [Line Items]      
2016 Revolving Credit Facility   $ 0 $ 0
Revolving Credit Facility | Two Thousand Twenty Vehicle Floor Plan Facility      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Increase (Decrease), Net $ 584,000,000.0    
Current borrowing capacity   1,550,000,000  
Maximum borrowing capacity   $ 1,800,000,000  
Maximum aggregate commitments allocated to commitments under the 2016 Used Vehicle Floor Plan Facility   40.00%  
Revolving Credit Facility | TwoThousandTwentyRevolvingCreditFacility      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Increase (Decrease), Net $ 4,500,000    
Current borrowing capacity   $ 250,000,000.0  
Maximum borrowing capacity   300,000,000.0  
Borrowing base   236,600,000  
2016 Revolving Credit Facility   0  
Letters of credit outstanding amount   12,300,000  
Borrowing availability amount   $ 224,300,000  
Maximum dividend (usd per share)   $ 0.12