Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

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:

	2019		2018		2017
Shares repurchased	1.3		2.1		10.1
Aggregate purchase price	$	44.7	$	100.0	$	434.9
Average purchase price per share	$	35.51	$	47.58	$	42.99

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:

	2019		2018		2017
Shares issued	0.4		0.5		1.0
Proceeds from the exercise of stock options	$	12.7	$	17.8	$	39.7
Average exercise price per share	$	33.87	$	35.25	$	37.85

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 the 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:

(In actual number of shares)	2019	2018	2017
Shares issued	306,346	122,661	20,000
Shares surrendered to AutoNation to satisfy tax withholding obligations	85,331	56,027	26,514