Share-based compensation - PSU activity (Details)	3 Months Ended
Mar. 31, 2024 Milestone $ / shares shares	Dec. 31, 2023 Milestone
Other disclosure
Number of Milestones Achieved \| Milestone	2
Number of Milestones Achievement Considered Probable \| Milestone	2	2
Minimum
Other disclosure
Service period	1 year
Maximum
Other disclosure
Service period	3 years
Performance Share Awards \| 2014 Plan
Number of shares
Non-vested at beginning of period (in shares) \| shares	222,550
Forfeited (in shares) \| shares	(17,030)
Non-vested at end of period (in shares) \| shares	205,520
Weighted average grant-date fair value
Non-vested at beginning of period (in dollars per share) \| $ / shares	$ 28.09
Forfeited (in dollars per share) \| $ / shares	27.12
Non-vested at end of period (in dollars per share) \| $ / shares	$ 27.99

Number of defined milestones achieved for awards under share-based payment arrangement.

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- Definition

Number of defined milestones of which achievement is considered probable for awards under share-based payment arrangement.

+ References

No definition available.

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- Definition

Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 55
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482943/710-10-55-7

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-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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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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- 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.

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- Definition

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.

+ 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

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-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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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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.

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