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Share-based payments (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Nov. 30, 2021
Aug. 31, 2021
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum employee contribution, percentage         4.00%  
Granted, Shares          
Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employer matching contribution, percentage         50.00%  
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employer matching contribution, percentage         100.00%  
Performance Share Unit Plans [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Market value of shares vested and released         $ 0 $ 0
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options granted (in shares)         697,536  
Unrecognized compensation costs $ 9,400,000     $ 9,400,000 $ 9,400,000  
Unrecognized compensation costs, period for recognition         2 years 2 months 12 days  
Premium Priced Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average grant date fair value of options granted       $ 8.00    
Stock options granted (in shares)       0 119,157  
Unrecognized compensation costs 6,400,000     $ 6,400,000 $ 6,400,000  
Unrecognized compensation costs, period for recognition         2 years 1 month 6 days  
Performance Share Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation costs $ 17,800,000     $ 17,800,000 $ 17,800,000  
Unrecognized compensation costs, period for recognition         1 year 10 months 24 days  
Performance Share Units With Market Conditions [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options granted (in shares)       0    
Weighted average grant-date fair value of awards       $ 69.92    
Performance period 2 years 3 years 3 years      
Award holding period       1 year    
Discount value       $ 5.34    
Effective tax rate       35.00%    
Unrecognized compensation costs $ 4,500,000     $ 4,500,000 $ 4,500,000  
Unrecognized compensation costs, period for recognition         1 year 10 months 24 days  
Restricted Share Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation costs 2,100,000     2,100,000 $ 2,100,000  
Unrecognized compensation costs, period for recognition         1 year 6 months  
Deferred Share Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation costs 0     0 $ 0  
Share unit liability $ 11,300,000     $ 11,300,000 $ 11,300,000 $ 10,100,000