Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2011

Stockholders' Equity Note [Abstract]

Shares Repurchased Under Share Repurchase Program

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Shares repurchased	5.7		2.9		10.8		25.9
Aggregate purchase price	$	195.9	$	55.0	$	365.6	$	506.6
Average purchase price per share	$	34.66	$	19.08	$	33.85	$	19.59

Common Stock Issued With The Exercise Of Stock Options

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Shares issued	1.4		1.6		3.8		1.9
Proceeds from exercise of stock options	$	26.3	$	24.5	$	66.3	$	30.1
Average exercise price per share	$	18.35	$	15.35	$	17.54	$	15.53

Restricted Stock Grants And Shares Surrendered to Satisfy Tax Withholdings

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2011	2010	2011	2010
Shares issued	—	—	163,892	188,740
Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock	11,688	12,796	42,985	33,485