Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUES	$ 2,131.2	$ 3,005.7	$ 4,822.0	$ 5,814.1
COST OF SALES	1,772.4	2,551.4	4,046.7	4,928.3
GROSS PROFIT	358.8	454.3	775.3	885.8
Selling, general and administrative expenses	237.2	338.7	565.1	666.4
Depreciation and amortization expense	18.8	17.9	37.4	34.9
Asset impairments	23.8	0.5	23.8	0.5
INCOME (LOSS) FROM OPERATIONS	79.0	97.1	148.9	183.9
Floorplan interest expense	10.1	15.9	23.0	31.6
Other interest expense, net	16.2	18.0	34.3	36.9
(Gain) loss on extinguishment of debt	10.4	0.0	10.4	0.0
INCOME (LOSS) BEFORE INCOME TAXES	42.3	63.2	81.2	115.4
(Benefit) provision for income taxes	12.2	14.0	21.3	27.5
NET INCOME (LOSS)	$ 30.2	$ 49.2	$ 60.0	$ 87.9
BASIC EARNINGS (LOSS) PER SHARE (in dollars per share)	$ 1.64	$ 2.65	$ 3.25	$ 4.74
Weighted average common shares outstanding (in shares)	17,771,447	17,908,039	17,767,449	17,852,985
DILUTED EARNINGS (LOSS) PER SHARE (in dollars per share)	$ 1.63	$ 2.64	$ 3.25	$ 4.73
Weighted average dilutive common shares outstanding (in shares)	17,811,613	17,930,280	17,809,937	17,877,676
New vehicle retail sales
REVENUES	$ 1,062.7	$ 1,565.4	$ 2,404.8	$ 2,979.9
COST OF SALES	998.9	1,495.7	2,278.3	2,838.8
Used vehicle retail sales
REVENUES	641.2	838.9	1,420.3	1,658.1
COST OF SALES	594.9	785.6	1,331.8	1,557.0
Used vehicle wholesale sales
REVENUES	48.7	96.0	135.2	188.1
COST OF SALES	46.6	96.1	132.1	187.8
Parts and service sales
REVENUES	282.0	378.2	652.6	747.3
COST OF SALES	132.0	174.1	304.5	344.8
Finance, insurance and other, net
REVENUES	$ 96.7	$ 127.3	$ 209.2	$ 240.6