FLOOR PLAN NOTES PAYABLE—TRADE (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Floor plan notes payable—trade	$ 146.5	$ 125.3
Floor plan notes payable offset account	(16.2)	(11.3)
Total floor plan notes payable—trade, net	130.3	$ 114.0
Floor plan notes payable—trade, liabilities associated with assets held for sale	$ 21.9