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Intangible Franchise Rights and Goodwill (Details Textual)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
Intangible Franchise Rights and Goodwill (Textual) [Abstract]      
Accumulated Impairments $ 97.8 $ 42.4  
U.S. [Member]      
Intangible Franchise Rights and Goodwill (Textual) [Abstract]      
Number Of Dealerships Acquired 3 7 9
U.K. [Member]      
Intangible Franchise Rights and Goodwill (Textual) [Abstract]      
Number Of Dealerships Acquired   3 4
Brazil [Member]      
Intangible Franchise Rights and Goodwill (Textual) [Abstract]      
Number Of Dealerships Acquired     18