Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Accumulated depreciation	$ 421.6	$ 400.2
Offset account related to floorplan notes payable - credit facility	99.7	106.8
Offset account related to floorplan notes payable - manufacturer affiliates	$ 8.1	$ (4.1)
Common stock, $0.01 par value, 50,000,000 shares authorized; 25,439,581 and 25,486,711 shares issued, respectively
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	50,000,000	50,000,000
Shares issued (in shares)	25,439,581	25,486,711
Treasury stock (in shares)	7,179,357	6,858,503