Unaudited Condensed Consolidated Income Statements (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
TOTAL REVENUE	$ 4,909.0	$ 4,470.8	$ 14,061.0	$ 12,993.7
TOTAL COST OF SALES (excluding depreciation shown below)	4,156.1	3,774.2	11,855.8	10,937.0
TOTAL GROSS PROFIT	752.9	696.6	2,205.2	2,056.7
Selling, general, and administrative expenses	522.3	485.1	1,547.6	1,452.5
Depreciation and amortization	27.2	24.1	79.0	70.1
Other expenses (income), net	(4.0)	0.2	(15.7)	(3.4)
OPERATING INCOME	207.4	187.2	594.3	537.5
Non-operating income (expense) items:
Floorplan interest expense	(13.1)	(12.7)	(39.6)	(39.2)
Other interest expense	(21.7)	(22.3)	(64.6)	(66.6)
Interest income	0.1	0.1	0.2	0.2
Other income (loss), net	1.1	(0.7)	3.5	2.2
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	173.8	151.6	493.8	434.1
Income tax provision	67.1	58.8	190.9	168.0
NET INCOME FROM CONTINUING OPERATIONS	106.7	92.8	302.9	266.1
Loss from discontinued operations, net of income taxes	(0.2)	(0.2)	(0.9)	(0.6)
NET INCOME	106.5	92.6	302.0	265.5
BASIC EARNINGS (LOSS) PER SHARE:
Continuing operations (in dollars per share)	$ 0.91	$ 0.76	$ 2.56	$ 2.19
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ 0.00
Net income (in dollars per share)	$ 0.91	$ 0.76	$ 2.55	$ 2.19
Weighted average common shares outstanding (in shares)	117.0	121.5	118.5	121.3
DILUTED EARNINGS (LOSS) PER SHARE:
Continuing operations (in dollars per share)	$ 0.90	$ 0.75	$ 2.52	$ 2.16
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ 0.00
Net income (in dollars per share)	$ 0.90	$ 0.75	$ 2.51	$ 2.15
Weighted average common shares outstanding (in shares)	118.5	123.5	120.2	123.3
COMMON SHARES OUTSTANDING, net of treasury stock, at period end (in shares)	114.5	121.8	114.5	121.8
New Vehicle [Member]
TOTAL REVENUE	2,823.6	2,561.6	7,989.1	7,312.9
TOTAL COST OF SALES (excluding depreciation shown below)	2,666.5	2,406.2	7,524.5	6,866.6
TOTAL GROSS PROFIT	157.1	155.4	464.6	446.3
Used Vehicle [Member]
TOTAL REVENUE	1,148.5	1,044.7	3,280.5	3,110.9
TOTAL COST OF SALES (excluding depreciation shown below)	1,060.1	964.2	3,008.5	2,860.3
TOTAL GROSS PROFIT	88.4	80.5	272.0	250.6
Parts and Service [Member]
TOTAL REVENUE	717.4	653.8	2,093.2	1,946.3
TOTAL COST OF SALES (excluding depreciation shown below)	413.7	376.7	1,202.0	1,116.7
TOTAL GROSS PROFIT	303.7	277.1	891.2	829.6
Finance and Insurance, Net [Member]
TOTAL REVENUE	196.5	174.9	554.3	504.4
TOTAL GROSS PROFIT	196.5	174.9	554.3	504.4
Other Goods and Services [Member]
TOTAL REVENUE	23.0	35.8	143.9	119.2
TOTAL COST OF SALES (excluding depreciation shown below)	15.8	27.1	120.8	93.4
TOTAL GROSS PROFIT	$ 7.2	$ 8.7	$ 23.1	$ 25.8