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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
ASSETS
Allowance for accounts and notes receivable	$ 3.1	$ 3.2
Accumulated depreciation	369.1	347.3
Offset account related to floorplan notes payable - credit facility	(69.3)	(33.6)
Offset account related to floorplan notes payable - manufacturer affiliates	$ (0.2)	$ (0.1)
Common stock, $0.01 par value, 50,000 shares authorized; 25,510 and 25,494 issued, respectively
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	50,000,000,000	50,000,000,000
Shares issued (in shares)	25,510,281,000	25,494,408,000
Treasury stock (in shares)	6,926,995,000	7,171,661,000

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