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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Repayment of Sellers' Floor Plan Notes Payable Dealership Acquisitions $ 0.0 $ 138.5 $ 58.2
3.50% senior subordinated notes due 2025      
Interest rate (as a percent) 3.50%    
3.75% senior subordinated notes redeemed August 15, 2020      
Interest rate (as a percent) 3.75% 3.75%  
5.375% senior subordinated notes due 2024      
Interest rate (as a percent) 5.375% 5.375%  
5.75% senior subordinated notes due 2022      
Interest rate (as a percent) 5.75% 5.75%