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Share-based payments - Share-based compensation fair value assumptions (Details) | 6 Months Ended
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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

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