v3.26.1
Share-based compensation - RSU activity (Details) - Restricted Share Units - 2014 Plan
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 30, 2026
USD ($)
$ / shares
shares
Number of shares  
Non-vested at beginning of period (in shares) | shares 2,395,420
Granted (in shares) | shares 1,112,250
Vested (in shares) | shares (886,521)
Forfeited (in shares) | shares (113,350)
Non-vested at end of period (in shares) | shares 2,507,799
Weighted average grant-date fair value  
Non-vested at beginning of period (in dollars per share) | $ / shares $ 12.15
Granted (in dollars per share) | $ / shares 12.36
Vested (in dollars per share) | $ / shares 12.29
Forfeited (in dollars per share) | $ / shares 16.22
Non-vested at end of period (in dollars per share) | $ / shares $ 12.01
Other disclosure  
Total weighted average grant date fair value of RSUs granted during the period (in millions) | $ $ 13.8
Non-Executive Directors  
Other disclosure  
Vesting period (in years) 1 year
Maximum | Other than non-executive directors  
Other disclosure  
Vesting period (in years) 3 years