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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Accumulated depreciation	$ 380.5	$ 347.3
Offset account related to floorplan notes payable - credit facility	25.0	33.6
Offset account related to floorplan notes payable - manufacturer affiliates	$ 0.2	$ 0.1
Common stock, $0.01 par value, 50,000,000 shares authorized; 25,504,131 and 25,494,328 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)	25,504,131	25,494,328
Treasury stock (in shares)	6,885,019	7,171,661

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