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Property and Equipment (Including Concession Assets) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross $ 8,754.2 $ 8,073.7
Accumulated depreciation and amortization 1,844.8 1,717.4
Property and equipment (including concession assets), net 6,909.4 6,356.3
Accumulated amortization 466.3 444.1
Concession assets, net of accumulated amortization 1,983.2 1,951.0
Land [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 216.3 216.4
Concession land rights [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 141.2 141.2
Road property [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 6,206.9 5,955.7
Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 1,862.5 1,436.2
Technology and other [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 153.9 152.8
Construction in progress [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross $ 173.4 $ 171.4