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Share-based compensation - LTIP Linked to TRS (Details) - LTIP linked to TRS - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Shares      
Outstanding, beginning of period (in shares) 90,974 89,222 96,402
Granted (in shares) 26,469 46,024 24,630
Vested (issued or unissued and cancelled) (in shares) (29,042) (32,355) (29,409)
Forfeited (in shares) (16,827) (11,917) (2,401)
Outstanding, end of period (in shares) 71,574 90,974 89,222
Weighted-Average Grant-Date Fair Value Per Share      
Outstanding, beginning of period (in dollars per share) $ 42.86 $ 42.10 $ 39.62
Granted (in dollars per share) 54.92 41.12 48.62
Vested (issued or unissued and cancelled) (in dollars per share) 41.07 38.20 39.51
Forfeited (in dollars per share) 44.45 43.07 41.22
Outstanding, end of period (in dollars per share) $ 47.67 $ 42.86 $ 42.10
Total weighted-average grant-date fair value of shares granted (in millions) $ 1.5 $ 1.9 $ 1.2