CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Repayment of Sellers' Floor Plan Notes Payable Dealership Acquisitions	$ 0.0	$ 138.5
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%