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Share-based compensation - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
performanceFactor
shares
Dec. 31, 2019
USD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares reserved for future grants of stock options and share appreciation rights (in shares) | shares 3,654,046  
Liabilities from share-based payment transactions $ 71,913 $ 18,382
SARs and TSARs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 7 years  
Vesting rate 33.33%  
Fair value of share-based payment transactions $ 44,600  
Liabilities from share-based payment transactions 40,400  
Intrinsic value of liabilities from share-based payment transactions $ 4,200  
Weighted average remaining vesting period 1 year 8 months 12 days  
Expense from share-based payment transactions with employees $ 33,100 8,700
Expense from share-based payment transactions with employees, effect of change in share price $ 27,200 13,700
Performance Share Units (PSU) New Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 3 years  
Number of performance factors | performanceFactor 2  
Deferred, Restricted and Performance Share Units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of share-based payment transactions $ 46,900  
Liabilities from share-based payment transactions 31,500  
Intrinsic value of liabilities from share-based payment transactions $ 15,400  
Weighted average remaining vesting period 1 year 8 months 12 days  
Expense from share-based payment transactions with employees $ 22,000 4,500
Expense from share-based payment transactions with employees, effect of change in share price $ 11,400 4,900
Stock Options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 7 years  
Vesting rate 33.33%  
Expense from share-based payment transactions with employees $ 100 $ 200
Bottom of range | Performance Share Units (PSU) New Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation arrangement vesting rights, percentage 0.00%  
Top of range | Performance Share Units (PSU) New Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation arrangement vesting rights, percentage 200.00%