Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 69.2		$ 69.7
Receivables, net	740.9		698.4
Inventory	2,827.2		2,396.9
Other current assets	192.7		196.1
Total Current Assets	3,830.0		3,361.1
PROPERTY AND EQUIPMENT, NET	2,235.3		2,095.1
GOODWILL, NET	1,259.6	[1]	1,237.4	[1]
OTHER INTANGIBLE ASSETS, NET	335.1		291.3
OTHER ASSETS	254.1		218.1
Total Assets	7,914.1		7,203.0
CURRENT LIABILITIES:
Vehicle floorplan payable	3,029.0		2,540.2
Accounts payable	263.0		217.2
Current maturities of long-term debt	30.1		29.8
Other current liabilities	429.7		414.5
Total Current Liabilities	3,751.8		3,201.7
LONG-TERM DEBT, NET OF CURRENT MATURITIES	1,809.8		2,066.3
DEFERRED INCOME TAXES	116.5		89.4
OTHER LIABILITIES	174.3		157.1
COMMITMENTS AND CONTINGENCIES (Note 8)
SHAREHOLDERS' EQUITY:
Preferred stock, par value $0.01 per share; 5,000,000 shares authorized; none issued	0		0
Common stock, par value $0.01 per share; 1,500,000,000 shares authorized; 163,562,149 shares issued at December 31, 2013 and 2012, including shares held in treasury	1.6		1.6
Additional paid-in capital	42.8		26.6
Retained earnings	3,337.9		2,963.0
Treasury stock, at cost; 42,646,753 and 42,705,580 shares held, respectively	(1,320.6)		(1,302.7)
Total Shareholders' Equity	2,061.7		1,688.5
Total Liabilities and Shareholders' Equity	7,914.1		7,203.0
Trade [Member]
CURRENT LIABILITIES:
Vehicle floorplan payable	2,130.1		1,766.3
Non-Trade [Member]
CURRENT LIABILITIES:
Vehicle floorplan payable	$ 898.9		$ 773.9

[1] Net of accumulated impairment losses of $1.47 billion ($1.25 billion after-tax) associated with our single reporting unit (prior to September 30, 2008, our reporting unit structure was comprised of a single reporting unit) and $140.0 million ($119.0 million after-tax) associated with our Domestic reporting unit, both of which were recorded during the year ended December 31, 2008.