Unaudited Condensed Consolidated Income Statements (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
TOTAL REVENUE	$ 3,933.8	$ 3,506.5	$ 11,495.3	$ 10,153.9
TOTAL COST OF SALES	3,311.2	2,931.3	9,641.7	8,429.1
TOTAL GROSS PROFIT	622.6	575.2	1,853.6	1,724.8
Selling, general, and administrative expenses	435.8	411.4	1,307.3	1,236.7
Depreciation and Amortization	22.9	20.9	64.9	62.7
Franchise rights impairment	0	0	4.2	0
Other expenses (income), net	0.2	(1.2)	0.6	(3.1)
OPERATING INCOME	163.7	144.1	476.6	428.5
Floorplan interest expense	(11.4)	(9.7)	(32.9)	(31.8)
Other interest expense	(22.2)	(16.4)	(65.2)	(48.6)
Interest income	0	0	0.2	0.6
Other income (loss), net	2.5	(2.4)	3.1	(0.2)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	132.6	115.6	381.8	348.5
Income tax provision	50.7	44.9	147.4	134.2
NET INCOME FROM CONTINUING OPERATIONS	81.9	70.7	234.4	214.3
Loss from discontinued operations, net of income taxes	(0.3)	0	(1.2)	(2.3)
NET INCOME	81.6	70.7	233.2	212.0
BASIC EARNINGS (LOSS) PER SHARE:
Continuing operations	$ 0.68	$ 0.49	$ 1.88	$ 1.46
Discontinued operations	$ 0.00	$ 0.00	$ (0.01)	$ (0.02)
Net income	$ 0.67	$ 0.49	$ 1.87	$ 1.44
Weighted average common shares outstanding	121.2	144.4	124.4	146.9
DILUTED EARNINGS (LOSS) PER SHARE:
Continuing operations	$ 0.66	$ 0.48	$ 1.85	$ 1.43
Discontinued operations	$ 0.00	$ 0.00	$ (0.01)	$ (0.02)
Net income	$ 0.66	$ 0.48	$ 1.84	$ 1.42
Weighted average common shares outstanding	123.4	147.0	126.4	149.5
COMMON SHARES OUTSTANDING, net of treasury stock	121.7	141.4	121.7	141.4
New Vehicle [Member]
TOTAL REVENUE	2,240.5	1,881.6	6,430.9	5,413.3
TOTAL COST OF SALES	2,095.8	1,743.4	6,006.7	5,013.1
TOTAL GROSS PROFIT	144.7	138.2	424.2	400.2
Used Vehicle [Member]
TOTAL REVENUE	936.4	911.9	2,802.6	2,630.6
TOTAL COST OF SALES	863.7	845.4	2,571.7	2,407.4
TOTAL GROSS PROFIT	72.7	66.5	230.9	223.2
Parts and Service [Member]
TOTAL REVENUE	596.8	578.0	1,799.2	1,720.0
TOTAL COST OF SALES	345.0	336.1	1,043.8	988.4
TOTAL GROSS PROFIT	251.8	241.9	755.4	731.6
Finance and Insurance, Net [Member]
TOTAL REVENUE	147.0	121.9	422.3	349.6
TOTAL GROSS PROFIT	147.0	121.9	422.3	349.6
Other Goods and Services [Member]
TOTAL REVENUE	13.1	13.1	40.3	40.4
TOTAL COST OF SALES	6.7	6.4	19.5	20.2
TOTAL GROSS PROFIT	$ 6.4	$ 6.7	$ 20.8	$ 20.2