Stock-based compensation - Summary of Performance Share Units Plan (Details) - PSUs and PDSUs - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] (in shares)
Outstanding, January 1 (in shares)	1,336,358	1,577,781
Granted (in shares)	917,744	429,166
Issued in lieu of dividends (in shares)	10,845	11,207
Settled (in shares)	(460,667)	(637,073)
PDSUs converted into DSUs (in shares)	(45,058)	0
Forfeited (in shares)	(80,669)	(44,723)
Outstanding, December 31 (in shares)	1,678,553	1,336,358