v3.26.1
Shareholders' equity - Common Shares Issued and Outstanding (Details) - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Movement In Common Stock Outstanding [Roll Forward]      
Common shares issued, beginning of period (in shares)   116,989,799  
Common shares outstanding, beginning of period (in shares)   116,989,799  
Shares repurchased (in shares) (2,237,688) (3,290,298)  
Common shares issued, end of period (in shares) 116,065,965 116,065,965  
Common shares outstanding, end of period (in shares) 116,065,965 116,065,965  
Common Stock      
Movement In Common Stock Outstanding [Roll Forward]      
Common shares issued, beginning of period (in shares)   116,989,799 116,429,057
Common shares outstanding, beginning of period (in shares)   116,989,799 116,429,057
Issuance of common shares upon exercise of options (in shares)   0 100,000
Shares repurchased (in shares)   (3,290,298) (500,000)
Common shares issued, end of period (in shares) 116,065,965 116,065,965 116,759,539
Common shares outstanding, end of period (in shares) 116,065,965 116,065,965 116,759,539
Restricted share awards | Common Stock      
Movement In Common Stock Outstanding [Roll Forward]      
Issuance of common shares, net of forfeitures and shares withheld (in shares)   2,366,464 730,482