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Shareholders' Equity (Stock Options Exercised and Restricted Stock Grants) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity Note [Abstract]      
Shares issued for stock option exercises (in shares) 1,300,000 1,700,000 1,100,000
Proceeds from the exercise of stock options $ 30.0 $ 35.1 $ 22.7
Average exercise price per share (in dollars per share) $ 23.33 $ 20.50 $ 20.31
Restricted stock, shares issued 159,442 154,540 137,144
Shares surrendered to AutoNation to satisfy tax witholding obligations in connection with the vesting of restricted stock or to pay for an option exercise 36,712 46,752 44,738