Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
REVENUES	$ 2,690.8	$ 2,808.4
COST OF SALES	2,274.3	2,376.9
GROSS PROFIT	416.5	431.5
Selling, general and administrative expenses	328.0	327.7
Depreciation and amortization expense	18.6	17.0
INCOME (LOSS) FROM OPERATIONS	69.9	86.8
INTEREST EXPENSE:
Floorplan interest expense	12.9	15.7
Other interest expense, net	18.1	18.9
INCOME (LOSS) BEFORE INCOME TAXES	38.9	52.2
(Benefit) provision for income taxes	9.1	13.5
NET INCOME (LOSS)	$ 29.8	$ 38.6
BASIC EARNINGS (LOSS) PER SHARE (in dollars per share)	$ 1.62	$ 2.09
Weighted average common shares outstanding (in shares)	17,763,451	17,797,318
DILUTED EARNINGS (LOSS) PER SHARE (in dollars per share)	$ 1.61	$ 2.08
Weighted average dilutive common shares outstanding (in shares)	17,808,261	17,849,334
New vehicle retail sales
REVENUES	$ 1,342.2	$ 1,414.5
COST OF SALES	1,279.4	1,343.1
Used vehicle retail sales
REVENUES	779.0	819.2
COST OF SALES	736.9	771.4
Used vehicle wholesale sales
REVENUES	86.5	92.1
COST OF SALES	85.5	91.7
Parts and service sales
REVENUES	370.6	369.2
COST OF SALES	172.6	170.7
Finance, insurance and other, net
REVENUES	$ 112.5	$ 113.4