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Share-based compensation plans - Activity Related to PCSUs, Restricted Stock Units and Deferred Compensation Plans (Details) - $ / shares	12 Months Ended
	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

Share-based compensation arrangement by share-based payment award, equity instruments other than options, converted in period.

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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

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-Topic 718
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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.

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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).

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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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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