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Shareholders' Equity (Stock Options Exercised and Restricted Stock Grants) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stockholders' Equity Note [Abstract]      
Shares issued (in shares) 1,700,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 1,100,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 1,700,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Proceeds from the exercise of stock options $ 35.1an_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalConsiderationExerciseOfStockOptions $ 22.7an_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalConsiderationExerciseOfStockOptions $ 32.0an_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalConsiderationExerciseOfStockOptions
Average exercise price per share (in dollars per share) $ 20.50us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice $ 20.31us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice $ 19.33us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Shares issued 154,540us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 137,144us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 160,740us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Shares surrendered to AutoNation to satisfy tax witholding obligations in connection with the vesting of restricted stock or to pay for an option exercise 46,752us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 44,738us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 81,717us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation