Shareholders' Equity (Restricted Stock Grants And Shares Surrendered To Satisfy Tax Withholdings) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stockholders' Equity Note [Abstract]
Shares issued	0	1,754	138,424	157,082
Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock	24,125	26,928	32,885	35,927