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Share-based payments - Share-based compensation fair value assumptions (Details)
6 Months Ended
Jun. 30, 2018
USD ($)
2015 Plan  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Dividend Yield (%) 2.14%
Expected Volatility OEC (%) 25.16%
Expected Volatility Peer Group (%) 13.90%
Correlation 0.5234
Risk-free interest rate (%) 0.90%
Weighted average fair value of PSUs granted in USD $ 17.410
2016 Plan  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Dividend Yield (%) 2.23%
Expected Volatility OEC (%) 32.07%
Expected Volatility Peer Group (%) 18.12%
Correlation 0.4952
Risk-free interest rate (%) 0.76%
Weighted average fair value of PSUs granted in USD $ 17.210
2017 Plan  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Dividend Yield (%) 1.88%
Expected Volatility OEC (%) 33.77%
Expected Volatility Peer Group (%) 17.30%
Correlation 0.4574
Risk-free interest rate (%) 1.45%
Weighted average fair value of PSUs granted in USD $ 24.890