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Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Summary of the changes in the carrying amount of goodwill and franchise value  
Goodwill, Beginning Balance $ 1,144.5
Goodwill, Additions 54.5
Goodwill, Foreign currency translation 6.6
Goodwill, Ending Balance 1,205.6
Franchise value, Beginning Balance 295.4
Franchise value, Foreign currency translation 0.9
Franchise value, Ending Balance $ 296.3