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Employee compensation plans - Schedule of Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) | 12 Months Ended
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Dec. 31, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding (in shares) | shares | 2,674,512
Strike price (in dollars per share) | $ 36.87
Weighted Average Remaining Contractual Life | 2 years 10 months 24 days
Fair value (in dollars per share) | $ 12.37
January 11, 2019 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding (in shares) | shares | 473,956
Strike price (in dollars per share) | $ 26.45
Weighted Average Remaining Contractual Life | 12 days
Fair value (in dollars per share) | $ 14.88
January 10, 2020 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding (in shares) | shares | 484,790
Strike price (in dollars per share) | $ 27.54
Weighted Average Remaining Contractual Life | 1 year
Fair value (in dollars per share) | $ 14.98
January 11, 2021 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding (in shares) | shares | 583,389
Strike price (in dollars per share) | $ 32.16
Weighted Average Remaining Contractual Life | 2 years
Fair value (in dollars per share) | $ 13.30
January 7, 2022 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding (in shares) | shares | 617,707
Strike price (in dollars per share) | $ 49.57
Weighted Average Remaining Contractual Life | 3 years
Fair value (in dollars per share) | $ 7.52
January 6, 2023 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding (in shares) | shares | 514,670
Strike price (in dollars per share) | $ 45.33
Weighted Average Remaining Contractual Life | 4 years
Fair value (in dollars per share) | $ 12.38

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