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Acquisitions and Dispositions Acquisitions and Dispositions (Details textuals)
$ in Millions
 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Acquisitions and Dispositions (Textual) [Abstract]    
Business Combination, Consideration Transferred $ 61.2  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents $ 3.9  
Gain (Loss) on Disposition of Business   $ 0.7
U.S. [Member]    
Acquisitions and Dispositions (Textual) [Abstract]    
Number Of Dealerships Acquired   3
Number of Dealerships Disposed 4 1
Gain (Loss) on Disposition of Business $ 1.8  
Number of Franchises Disposed   1
U.K. [Member]    
Acquisitions and Dispositions (Textual) [Abstract]    
Number Of Dealerships Acquired 12  
Number of Franchises Acquired 17  
Brazil [Member]    
Acquisitions and Dispositions (Textual) [Abstract]    
Number Of Dealerships Acquired 1  
Number Of Dealerships Opened 2  
Number Of Franchises Awarded 1  
Number of Dealerships Disposed 4  
Gain (Loss) on Disposition of Business $ 0.8  
Number of Franchises Disposed   2