CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
REVENUES:
New vehicle	$ 926.2	$ 831.5	$ 1,756.7	$ 1,557.5
Used vehicle	507.6	445.3	981.0	862.2
Parts and service	188.2	168.2	364.9	327.6
Finance and insurance, net	67.6	58.4	128.8	111.8
Total revenues	1,689.6	1,503.4	3,231.4	2,859.1
COST OF SALES:
New vehicle	875.6	779.7	1,656.5	1,460.3
Used vehicle	473.9	411.9	912.0	794.8
Parts and service	68.8	63.9	135.2	126.0
Total cost of sales	1,418.3	1,255.5	2,703.7	2,381.1
GROSS PROFIT	271.3	247.9	527.7	478.0
OPERATING EXPENSES:
Selling, general and administrative	181.9	169.2	357.6	329.0
Depreciation and amortization	7.2	6.4	14.5	12.7
Other operating expense (income), net	0.0	0.1	0.3	(0.1)
Income from operations	82.2	72.2	155.3	136.4
OTHER EXPENSES:
Floor plan interest expense	(4.0)	(3.3)	(7.9)	(6.3)
Other interest expense, net	(10.5)	(9.5)	(20.8)	(18.6)
Swap interest expense	(0.5)	(0.4)	(1.0)	(1.0)
Total other expenses, net	(15.0)	(13.2)	(29.7)	(25.9)
Income before income taxes	67.2	59.0	125.6	110.5
INCOME TAX EXPENSE	26.1	22.8	48.6	42.8
INCOME FROM CONTINUING OPERATIONS	41.1	36.2	77.0	67.7
DISCONTINUED OPERATIONS, net of tax	0.0	(0.3)	0.0	(0.4)
NET INCOME	$ 41.1	$ 35.9	$ 77.0	$ 67.3
Basic—
Continuing operations (in dollars per share)	$ 1.53	$ 1.19	$ 2.84	$ 2.23
Discontinued operations (in dollars per share)	0.00	(0.01)	0.00	(0.01)
Net income (in dollars per share)	1.53	1.18	2.84	2.22
Diluted—
Continuing operations (in dollars per share)	1.52	1.19	2.82	2.21
Discontinued operations (in dollars per share)	0.00	(0.01)	0.00	(0.01)
Net income (in dollars per share)	$ 1.52	$ 1.18	$ 2.82	$ 2.20
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	26.8	30.3	27.1	30.3
Restricted stock (in shares)	0.1	0.1	0.1	0.2
Performance share units (in shares)	0.1	0.1	0.1	0.1
Diluted (in shares)	27.0	30.5	27.3	30.6