v3.25.3
Share-based compensation - RSU activity (Details) - Restricted Share Units - 2014 Plan
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Number of shares  
Non-vested at beginning of period (in shares) | shares 1,659,898
Granted (in shares) | shares 1,587,990
Vested (in shares) | shares (747,388)
Forfeited (in shares) | shares (213,147)
Non-vested at end of period (in shares) | shares 2,287,353
Weighted average grant-date fair value  
Non-vested at beginning of period (in dollars per share) | $ / shares $ 10.71
Granted (in dollars per share) | $ / shares 12.46
Vested (in dollars per share) | $ / shares 12.14
Forfeited (in dollars per share) | $ / shares 10.11
Non-vested at end of period (in dollars per share) | $ / shares $ 11.51
Other disclosure  
Total weighted average grant date fair value of RSUs granted during the period (in millions) | $ $ 19.8
Non-executive directors  
Other disclosure  
Vesting period (in years) 1 year
Minimum  
Other disclosure  
Vesting period (in years) 1 year
Maximum  
Other disclosure  
Vesting period (in years) 3 years