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Significant accounting policies (Table)
12 Months Ended
Dec. 31, 2018
Significant Accounting Policies [Abstract]  
Basis of presentation
Derivative financial instrumentsFair value through profit or loss (FVTPL)
Equity investmentsFair value through other comprehensive income
(FVOCI)
Liabilities for cash-settled share-based payment arrangementsFVTPL
Net defined benefit liabilityFair value of plan assets less the present value of the
defined benefit obligation
Disclosure of estimated useful lives
LandNot depreciated
Buildings15 - 25 years
Plant and equipment3 - 15 years
Furniture and fixtures3 - 10 years
Other3 - 5 years