Employee compensation plans - Schedule of Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs)	12 Months Ended
	Dec. 31, 2025 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	2,642,276
Strike price (in dollars per share)	$ 47.38
Weighted Average Remaining Contractual Life	3 years
Fair value (in dollars per share)	$ 29.82
January 11, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	526,499
Strike price (in dollars per share)	$ 32.16
Weighted Average Remaining Contractual Life	10 days
Fair value (in dollars per share)	$ 40.15
January 7, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	559,117
Strike price (in dollars per share)	$ 49.57
Weighted Average Remaining Contractual Life	1 year
Fair value (in dollars per share)	$ 24.67
January 6, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	472,630
Strike price (in dollars per share)	$ 45.33
Weighted Average Remaining Contractual Life	2 years
Fair value (in dollars per share)	$ 29.35
January 5, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	454,760
Strike price (in dollars per share)	$ 40.78
Weighted Average Remaining Contractual Life	3 years
Fair value (in dollars per share)	$ 34.30
January 6, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	629,270
Strike price (in dollars per share)	$ 64.48
Weighted Average Remaining Contractual Life	4 years
Fair value (in dollars per share)	$ 22.87