Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2016

Stockholders' Equity Note [Abstract]

Shares Repurchased Under Share Repurchase Program

A summary of shares repurchased under our stock repurchase program authorized by our Board of Directors follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Shares repurchased	1.0		2.5		9.9		3.5
Aggregate purchase price	$	50.0	$	150.0	$	470.6	$	209.1
Average purchase price per share	$	48.62	$	59.83	$	47.48	$	60.54

Common Stock Issued With The Exercise Of Stock Options

A summary of shares of common stock issued in connection with the exercise of stock options follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Shares issued	0.1		0.2		0.3		1.1
Proceeds from the exercise of stock options	$	4.6	$	5.4	$	7.8	$	24.1
Average exercise price per share	$	35.55	$	26.94	$	30.93	$	22.55

Restricted Stock Grants And Shares Surrendered to Satisfy Tax Withholdings

The following table presents a summary of shares of common stock issued in connection with grants of restricted stock and shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock (in actual number of shares):

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2016	2015	2016	2015
Shares issued	—	2,360	138,424	159,442
Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock	4,788	500	37,673	36,427