Employee compensation plans - Schedule of Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs)	12 Months Ended
	Dec. 31, 2024 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	2,642,736
Strike price (in dollars per share)	$ 0
Weighted Average Remaining Contractual Life	3 years
Fair value (in dollars per share)	$ 0
January 10, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	478,680
Strike price (in dollars per share)	$ 27.54
Weighted Average Remaining Contractual Life	9 days
Fair value (in dollars per share)	$ 36.57
January 11, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	573,329
Strike price (in dollars per share)	$ 32.16
Weighted Average Remaining Contractual Life	1 year
Fair value (in dollars per share)	$ 32.57
January 7, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	605,087
Strike price (in dollars per share)	$ 49.57
Weighted Average Remaining Contractual Life	2 years
Fair value (in dollars per share)	$ 18.87
January 6, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	506,170
Strike price (in dollars per share)	$ 45.33
Weighted Average Remaining Contractual Life	3 years
Fair value (in dollars per share)	$ 25.00
January 5, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	479,470
Strike price (in dollars per share)	$ 40.78
Weighted Average Remaining Contractual Life	4 years
Fair value (in dollars per share)	$ 29.48