Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

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,
	2017		2016		2017		2016
Shares repurchased	9.2		1.0		10.1		9.9
Aggregate purchase price	$	400.0	$	50.0	$	434.9	$	470.6
Average purchase price per share	$	43.28	$	48.62	$	42.99	$	47.48

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,
	2017		2016		2017		2016
Shares issued	0.1		0.1		0.7		0.3
Proceeds from the exercise of stock options	$	1.9	$	4.6	$	24.7	$	7.8
Average exercise price per share	$	35.27	$	35.55	$	33.77	$	30.93

Shares Issued And Shares Surrendered To Satisfy Tax Withholdings In Connection With Restricted Stock And Restricted Stock Units

The following table presents a summary of shares of common stock issued in connection with grants of restricted stock and settlement of restricted stock units (“RSUs”), as well as 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,
	2017	2016	2017	2016
Shares issued	—	—	20,000	152,683
Shares surrendered to AutoNation to satisfy tax withholding obligations	141	4,788	26,061	37,673