Stock-based compensation - Summary of Performance Share Units Plan (Details) - PSUs and PDSUs - shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] (in shares)
Outstanding, January 1 (in shares)	1,678,553	1,336,358
Granted (in shares)	593,748	917,744
Issued in lieu of dividends (in shares)	12,843	10,845
Settled (in shares)	(401,182)	(460,667)
PDSUs converted into DSUs (in shares)	(11,461)	(45,058)
Forfeited (in shares)	(128,768)	(80,669)
Outstanding, December 31 (in shares)	1,743,733	1,678,553