Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Reconciliation of revenue from segments to consolidated

	Years Ended December 31,
	2012		2011		2010
Revenues:
Domestic	$	5,131.6	$	4,655.4	$	4,111.3
Import	5,828.8		4,933.3		4,582.2
Premium Luxury	4,553.3		4,096.4		3,635.2
Total segment income	15,513.7		13,685.1		12,328.7
Corporate and other	155.1		147.2		132.3
Total consolidated revenue	$	15,668.8	$	13,832.3	$	12,461.0

Reconciliation of segment income (loss) to consolidated income from continuing operations before income taxes

	Years Ended December 31,
	2012			2011			2010
Segment income*:
Domestic	$	209.4		$	180.0		$	152.7
Import	257.9			227.1			188.2
Premium Luxury	270.4			244.1			219.7
Total segment income	737.7			651.2			560.6
Corporate and other	(137.9		)	(121.9		)	(106.5		)
Other interest expense	(86.9		)	(66.0		)	(56.1		)
Loss on debt extinguishment	—			(2.2		)	(19.6		)
Interest income	0.3			0.7			1.4
Other income (losses), net	3.6			(0.5		)	1.5
Income from continuing operations before income taxes	$	516.8		$	461.3		$	381.3

*Segment income for each of our segments is defined as operating income less floorplan interest expense.

Reconciliation of capital expenditures, floorplan interest expense, and depreciation and amortization from segments to consolidated

	Years Ended December 31,
	2012		2011		2010
Floorplan interest expense:
Domestic	$	20.2	$	20.4	$	19.3
Import	14.2		11.2		12.7
Premium Luxury	10.7		9.7		9.2
Corporate and other	0.4		1.4		1.3
Total floorplan interest expense	$	45.5	$	42.7	$	42.5
	Years Ended December 31,
	2012		2011		2010
Depreciation and amortization:
Domestic	$	23.0	$	20.7	$	20.3
Import	25.0		22.4		19.6
Premium Luxury	25.1		23.4		18.2
Corporate and other	14.2		17.2		18.7
Total depreciation and amortization	$	87.3	$	83.7	$	76.8

	Years Ended December 31,
	2012		2011		2010
Capital expenditures:
Domestic	$	69.5	$	31.7	$	23.2
Import	55.2		60.6		39.5
Premium Luxury	33.1		55.5		79.5
Corporate and other	25.8		10.3		19.6
Total capital expenditures	$	183.6	$	158.1	$	161.8

Reconciliation of assets from segment to consolidated

	Years Ended December 31,
	2012		2011		2010
Assets:
Domestic	$	1,883.8	$	1,557.7	$	1,447.7
Import	1,769.2		1,480.0		1,481.5
Premium Luxury	1,513.8		1,285.4		1,217.1
Corporate and other:
Goodwill	1,237.4		1,172.2		1,142.1
Franchise rights	285.7		212.6		199.1
Other Corporate and other assets	513.1		490.9		486.7
Total assets	$	7,203.0	$	6,198.8	$	5,974.2