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Share-based compensation - Changes in Share Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Restricted stock units        
Shares        
Outstanding, beginning of period (in shares) 22,172 90,903 65,628 189,024
Granted (in shares) 0 0 0 0
Vested (in shares) 0 (1,034) (42,452) (98,084)
Forfeited (in shares) 0 0 (1,004) (1,071)
Outstanding, end of period (in shares) 22,172 89,869 22,172 89,869
Total weighted-average grant-date fair value of shares granted (at target performance levels) (in millions) $ 0.0 $ 0.0 $ 0.0 $ 0.0
Weighted-average grant-date fair value per share        
Outstanding, beginning of period (in dollars per share) $ 42.41 $ 42.11 $ 42.09 $ 41.23
Granted (in dollars per share) 0 0 0 0
Vested (in dollars per share) 0 44.31 41.92 40.43
Forfeited (in dollars per share) 0 0 42.41 41.97
Outstanding, end of period (in dollars per share) $ 42.41 $ 42.08 $ 42.41 $ 42.08
LTIP linked to TRS        
Shares        
Outstanding, beginning of period (in shares) 543,467 109,643 98,441 76,477
Granted (in shares) 0 0 462,313 62,152
Vested (in shares) 0 0 (17,287) (28,577)
Forfeited (in shares) 0 (381) 0 (790)
Outstanding, end of period (in shares) 543,467 109,262 543,467 109,262
Total weighted-average grant-date fair value of shares granted (at target performance levels) (in millions) $ 0.0 $ 0.0 $ 5.2 $ 1.1
Weighted-average grant-date fair value per share        
Outstanding, beginning of period (in dollars per share) $ 13.50 $ 33.82 $ 31.36 $ 50.11
Granted (in dollars per share) 0 0 11.25 17.28
Vested (in dollars per share) 0 0 54.92 41.12
Forfeited (in dollars per share) 0 55.66 0 55.64
Outstanding, end of period (in dollars per share) $ 13.50 $ 33.75 $ 13.50 $ 33.75
LTIP awards linked to other performance conditions        
Shares        
Outstanding, beginning of period (in shares) 438,967 574,744 438,967 327,085
Granted (in shares) 0 0 0 362,963
Vested (in shares) 0 0 0 (113,118)
Increase above target/(cancelled) due to performance (in shares) 0 (11,407) 0 (11,953)
Forfeited (in shares) 0 (1,525) 0 (3,165)
Outstanding, end of period (in shares) 438,967 561,812 438,967 561,812
Total weighted-average grant-date fair value of shares granted (at target performance levels) (in millions) $ 0.0 $ 0.0 $ 0.0 $ 4.8
Weighted-average grant-date fair value per share        
Outstanding, beginning of period (in dollars per share) $ 18.17 $ 23.68 $ 18.17 $ 39.44
Granted (in dollars per share) 0 0 0 13.09
Vested (in dollars per share) 0 0 0 34.93
Increase above target/(cancelled) due to performance (in dollars per share) 0 42.37 0 42.32
Forfeited (in dollars per share) 0 42.07 0 42.06
Outstanding, end of period (in dollars per share) $ 18.17 $ 23.25 $ 18.17 $ 23.25