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Property and Equipment (Including Concession Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross $ 10,800.6 $ 10,461.8
Accumulated depreciation and amortization 2,553.3 2,392.1
Property and equipment (including concession assets), net 8,247.3 8,069.7
Accumulated amortization 648.6 610.7
Concession assets, net of accumulated amortization 2,154.7 2,131.6
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 218.7 219.2
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 7,369.4 7,186.0
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 2,496.7 2,439.8
Technology and other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 191.7 182.2
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross $ 382.9 $ 293.4