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Share-based compensation - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 01, 2014 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based compensation |  |  |  |  |
Income tax benefit |  | $ 2.1 | $ 1.4 | $ 1.0 |
Long-term incentive plan (LTIP) |  |  |  |  |
Share-based compensation |  |  |  |  |
Performance period |  | 3 years |  |  |
Exception to forfeiture, minimum requisite service period |  | 12 months |  |  |
Payout low end of range |  | 0.00% |  |  |
Payout high end of range |  | 200.00% |  |  |
Restricted stock units |  |  |  |  |
Share-based compensation |  |  |  |  |
Fair value |  | $ 4.2 | 3.0 | 4.2 |
Income tax benefit |  | 0.6 | 0.6 | 0.7 |
Unrecognized compensation cost |  | $ 4.3 |  |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized |  | 1 year 8 months 12 days |  |  |
LTIP linked to TRS |  |  |  |  |
Share-based compensation |  |  |  |  |
Fair value |  | $ 0.8 | 0.8 | 2.6 |
Income tax benefit |  | 0.1 | 0.2 | 0.4 |
Unrecognized compensation cost |  | $ 1.2 |  |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized |  | 1 year 6 months |  |  |
LTIP awards linked to other performance conditions |  |  |  |  |
Share-based compensation |  |  |  |  |
Fair value |  | $ 3.2 | 1.7 | 7.6 |
Income tax benefit |  | 0.4 | $ 0.4 | $ 1.2 |
Unrecognized compensation cost |  | $ 3.7 |  |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized |  | 1 year 4 months 24 days |  |  |
Equity and Incentive Plan (EIP) |  |  |  |  |
Share-based compensation |  |  |  |  |
Additional shares available for issuance (in shares) | 1,500,000 |  |  |  |
Shares remaining available for future issuance (in shares) |  | 2,800,000 |  |  |
Shares that can be issued upon vesting of outstanding units and achievement of performance goals (in shares) |  | 500,000 |  |  |
Equity and Incentive Plan (EIP) | Restricted shares |  |  |  |  |
Share-based compensation |  |  |  |  |
Vesting period |  | 3 years | 3 years | 4 years | 4 years
Equity and Incentive Plan (EIP) | Restricted shares | Share-based Payment Arrangement, Tranche One |  |  |  |  |
Share-based compensation |  |  |  |  |
Vesting percentage |  | 33.33% | 33.33% | 25.00% | 25.00%
Equity and Incentive Plan (EIP) | Restricted shares | Share-based Payment Arrangement, Tranche Two |  |  |  |  |
Share-based compensation |  |  |  |  |
Vesting percentage |  | 33.33% | 33.33% | 25.00% | 25.00%
Equity and Incentive Plan (EIP) | Restricted shares | Share-based Payment Arrangement, Tranche Three |  |  |  |  |
Share-based compensation |  |  |  |  |
Vesting percentage |  | 33.33% | 33.33% | 25.00% | 25.00%
Equity and Incentive Plan (EIP) | Restricted shares | Share-Based Payment Arrangement, Tranche Four |  |  |  |  |
Share-based compensation |  |  |  |  |
Vesting percentage |  |  |  | 25.00% | 25.00%
Nonemployee Director Stock Plan |  |  |  |  |
Share-based compensation |  |  |  |  |
Shares remaining available for future issuance (in shares) |  | 208,627 |  |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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