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Performance B.4.1. Share-based compensation - Narrative (Details)
12 Months Ended
Apr. 01, 2015
shares
Dec. 31, 2018
Dec. 31, 2015
plan
shares
Dec. 31, 2016
plan
Dec. 31, 2014
plan
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of plans | plan     4 2 2
Deferred share plans          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period   3 years      
Deferred share plans | Tranche One          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   16.50%      
Deferred share plans | Tranche Two          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   16.50%      
Deferred share plans | Tranche Three          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   67.00%      
2015 CEO Plan          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares granted (in shares) 77,344        
2015 Performance Plan          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fulfillment expectation   100.00%      
2015 Performance Plan | Tranche One          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   62.50%      
2015 Performance Plan | Tranche Two          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   37.50%      
2015 Executive Plan          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period   3 years      
Fulfillment expectation   100.00%      
2015 Executive Plan - CEO          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares granted (in shares)     26,664    
Shares in entity held by entity executive     3,333    
2015 Executive Plan - CFO          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares granted (in shares)     14,000    
Shares in entity held by entity executive     2,000    
2017 Performance Plan          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period   3 years      
2017 Performance Plan | Tranche One          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   25.00%      
2017 Performance Plan | Tranche Two          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   25.00%      
2017 Performance Plan | Tranche Three          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   50.00%      
2016 Performance Plan          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period   3 years      
2016 Performance Plan | Tranche One          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   25.00%      
2016 Performance Plan | Tranche Two          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   25.00%      
2016 Performance Plan | Tranche Three          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   50.00%      
2018 Performance Plan          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period   3 years      
2018 Performance Plan | Tranche One          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   25.00%      
2018 Performance Plan | Tranche Two          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   25.00%      
2018 Performance Plan | Tranche Three          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage   50.00%