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SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended
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Dec. 31, 2017
Customer order backlog |
Disclosure of detailed information about intangible assets [line items] |
Useful life of intangible asset | 15 years
Australian regulated terminal |
Disclosure of detailed information about intangible assets [line items] |
Remaining amortisation period of intangible asset | 83 years
Chilean toll roads |
Disclosure of detailed information about intangible assets [line items] |
Remaining amortisation period of intangible asset | 16 years
Indian toll roads |
Disclosure of detailed information about intangible assets [line items] |
Remaining amortisation period of intangible asset | 6 years
Peruvian toll roads |
Disclosure of detailed information about intangible assets [line items] |
Remaining amortisation period of intangible asset | 25 years
Buildings | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives | 70 years
Transmission stations, towers and related fixtures | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives | 40 years
Leasehold improvements | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives | 50 years
Plant and equipment | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives | 40 years
Network systems | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives | 60 years
Track | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives | 40 years
District energy systems | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives | 50 years
Gas storage assets | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives | 50 years

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