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Share-based compensation plans - Activity Related to PCSUs, Restricted Stock Units and Deferred Compensation Plans (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Restricted Stock Units (RSUs) |  |  |
Number of Shares |  |  |
Beginning Balance (in shares) | 662,260 |  |
Granted (in shares) | 383,708 |  |
Vested (in shares) | 0 |  |
Converted (in shares) | (231,157) |  |
Cancelled (in shares) | (62,103) |  |
Dividend equivalents (in shares) | 4,488 |  |
Ending Balance (in shares) | 757,196 | 662,260 |
Average Grant Date Fair Value per Share |  |  |
Beginning Balance, weighted-average grant date fair value (usd per share) | $ 54.71 |  |
Granted, weighted-average grant date fair value (usd per share) | 52.41 |  |
Converted, weighted-average grant date fair value (usd per share) | 55.27 |  |
Cancelled, weighted-average grant date fair value (usd per share) | 54.06 |  |
Dividend equivalents, weighted-average grant date fair value (usd per share) | 55.42 |  |
Ending Balance, weighted-average grant date fair value (usd per share) | $ 53.43 | $ 54.71 |
Restricted Stock Units (RSUs) | Nonvested |  |  |
Number of Shares |  |  |
Beginning Balance (in shares) | 593,445 |  |
Granted (in shares) | 383,708 |  |
Vested (in shares) | 234,610 |  |
Converted (in shares) |  |  |
Cancelled (in shares) | (62,103) |  |
Dividend equivalents (in shares) | 1,176 |  |
Ending Balance (in shares) | 681,616 | 593,445 |
Restricted Stock Units (RSUs) | Vested |  |  |
Number of Shares |  |  |
Beginning Balance (in shares) | 68,815 |  |
Granted (in shares) | 0 |  |
Vested (in shares) | 234,610 |  |
Converted (in shares) | (231,157) |  |
Cancelled (in shares) | 0 |  |
Dividend equivalents (in shares) | 3,312 |  |
Ending Balance (in shares) | 75,580 | 68,815 |
Performance Contingent Restricted Stock Units (PCSUs) |  |  |
Number of Shares |  |  |
Beginning Balance (in shares) | 654,895 |  |
Granted (in shares) | 253,176 |  |
Performance adjustments (in shares) | (21,184) |  |
Vested (in shares) | 0 |  |
Converted (in shares) | (217,966) |  |
Cancelled (in shares) | (35,832) |  |
Dividend equivalents (in shares) | 667 |  |
Ending Balance (in shares) | 633,756 | 654,895 |
Average Grant Date Fair Value per Share |  |  |
Beginning Balance, weighted-average grant date fair value (usd per share) | $ 53.51 |  |
Granted, weighted-average grant date fair value (usd per share) | 50.54 | $ 55.04 | $ 51.94
Performance adjustments, weighted-average grant date fair value (usd per share) | 41.05 |  |
Converted, weighted-average grant date fair value (usd per share) | 55.48 |  |
Cancelled, weighted-average grant date fair value (usd per share) | 52.32 |  |
Dividend equivalents, weighted-average grant date fair value (usd per share) | 55.40 |  |
Ending Balance, weighted-average grant date fair value (usd per share) | $ 52.13 | $ 53.51 |
Performance Contingent Restricted Stock Units (PCSUs) | Nonvested |  |  |
Number of Shares |  |  |
Beginning Balance (in shares) | 418,403 |  |
Granted (in shares) | 253,176 |  |
Performance adjustments (in shares) | (21,184) |  |
Vested (in shares) | 330,888 |  |
Converted (in shares) | 0 |  |
Cancelled (in shares) | (35,832) |  |
Dividend equivalents (in shares) | 0 |  |
Ending Balance (in shares) | 283,675 | 418,403 |
Performance Contingent Restricted Stock Units (PCSUs) | Vested |  |  |
Number of Shares |  |  |
Beginning Balance (in shares) | 236,492 |  |
Granted (in shares) | 0 |  |
Performance adjustments (in shares) | 0 |  |
Vested (in shares) | 330,888 |  |
Converted (in shares) | (217,966) |  |
Cancelled (in shares) | 0 |  |
Dividend equivalents (in shares) | 667 |  |
Ending Balance (in shares) | 350,081 | 236,492 |
Deferred Compensation Plans |  |  |
Number of Shares |  |  |
Beginning Balance (in shares) | 324,602 |  |
Deferred (in shares) | 34,113 |  |
Converted (in shares) | (8,541) |  |
Dividend equivalents (in shares) | 11,249 |  |
Ending Balance (in shares) | 361,423 | 324,602 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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