XML 47 R31.htm IDEA: XBRL DOCUMENT v3.8.0.1
Property and Equipment (Including Concession Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross $ 10,927.4 $ 10,461.8
Accumulated depreciation and amortization 2,591.8 2,392.1
Property and equipment (including concession assets), net 8,335.6 8,069.7
Accumulated amortization 667.5 610.7
Concession assets, net of accumulated amortization 2,177.8 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 7,438.5 7,186.0
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 2,530.9 2,439.8
Technology and other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross 209.7 182.2
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment (including concession assets), gross $ 388.4 $ 293.4