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Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Intangible Assets      
Goodwill, Accumulated impairment loss     $ 606.3
Franchise value, Accumulated impairment loss     37.1
Summary of the changes in the carrying amount of goodwill and franchise value      
Goodwill, Beginning Balance 967.3 889.9  
Goodwill, Additions 169.3 61.7  
Goodwill, Deconsolidation of Italian investment (7.2)    
Goodwill, Reconsolidation of Italian investment 7.4    
Goodwill, Foreign currency translation 7.7 15.7  
Goodwill, Ending Balance 1,144.5 967.3  
Franchise value, Beginning Balance 271.7 214.4  
Franchise value, Additions 22.1 53.4  
Franchise value, Deconsolidation of Italian investment (2.9)    
Franchise value, Reconsolidation of Italian investment 3.1    
Franchise value, Foreign currency translation 1.4 3.9  
Franchise value, Ending Balance $ 295.4 $ 271.7