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Goodwill and Intangible Assets, Net (Goodwill) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]      
Goodwill, beginning balance [1] $ 1,394.5 $ 1,314.7  
Acquisitions and other adjustments 116.8 79.8  
Goodwill, ending balance [1] 1,511.3 1,394.5  
Accumulated impairment losses 1,470.0 1,470.0 $ 1,470.0
Reporting Unit, Domestic [Member]      
Goodwill [Roll Forward]      
Goodwill, beginning balance [1] 203.1 175.1  
Acquisitions and other adjustments 49.0 28.0  
Goodwill, ending balance [1] 252.1 203.1  
Accumulated impairment losses 140.0 140.0 $ 140.0
Reporting Unit, Import [Member]      
Goodwill [Roll Forward]      
Goodwill, beginning balance [1] 570.9 551.6  
Acquisitions and other adjustments (12.7) 19.3  
Goodwill, ending balance [1] 558.2 570.9  
Reporting Unit, Premium Luxury [Member]      
Goodwill [Roll Forward]      
Goodwill, beginning balance [1] 620.5 588.0  
Acquisitions and other adjustments 76.9 32.5  
Goodwill, ending balance [1] 697.4 620.5  
Goodwill Corporate and Other [Member]      
Goodwill [Roll Forward]      
Goodwill, beginning balance [1] 0.0 0.0  
Acquisitions and other adjustments 3.6 0.0  
Goodwill, ending balance [1] $ 3.6 $ 0.0  
[1] Net of accumulated impairment losses of $1.47 billion associated with our single reporting unit (prior to September 30, 2008, our reporting unit structure was comprised of a single reporting unit) and $140.0 million associated with our Domestic reporting unit, both of which were recorded during the year ended December 31, 2008.