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Share-based payment arrangements - Long term incentive plan 2017 (Cash-settled) (Details) - shares
12 Months Ended
Feb. 09, 2017
Feb. 02, 2016
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period     5 years
Executive Committee | Phantom Share Units (PSUs)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Annual vesting percentage 33.30% 33.30%  
Long Term Incentive Plan 2017 | Executive Committee | Phantom Share Units (PSUs)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of phantom stocks granted (in shares) 66,449    
Second anniversary | Long Term Incentive Plan 2017 | Phantom Share Units (PSUs)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Annual vesting percentage     33.33%
Second anniversary | Long Term Incentive Plan 2017 | Executive Committee | Phantom Share Units (PSUs)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Annual vesting percentage     33.33%
Vesting period     2 years
Third anniversary | Long Term Incentive Plan 2017 | Phantom Share Units (PSUs)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Annual vesting percentage     33.33%
Third anniversary | Long Term Incentive Plan 2017 | Executive Committee | Phantom Share Units (PSUs)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Annual vesting percentage     33.33%
Vesting period     3 years
Fourth anniversary | Long Term Incentive Plan 2017 | Phantom Share Units (PSUs)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Annual vesting percentage     33.33%
Fourth anniversary | Long Term Incentive Plan 2017 | Executive Committee | Phantom Share Units (PSUs)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Annual vesting percentage     33.33%
Vesting period     4 years