Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

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				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Shares repurchased	1.6		0.9		2.1		0.9
Aggregate purchase price	$	73.4	$	34.9	$	100.0	$	34.9
Average purchase price per share	$	47.30	$	39.92	$	47.58	$	39.92

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				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Shares issued (in actual number of shares)	42,092		46,817		301,167		678,858
Proceeds from the exercise of stock options	$	0.9	$	1.3	$	14.2	$	22.8
Average exercise price per share	$	22.50	$	28.55	$	47.14	$	33.65

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 and settlement of RSUs:



	Three Months Ended		Six Months Ended
	June 30,		June 30,
(In actual number of shares)	2018	2017	2018	2017
Shares issued	9,837	—	122,661	20,000
Shares surrendered to AutoNation to satisfy tax withholding obligations	9,730	17,796	55,420	25,920