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Defined contribution and defined benefit retirement plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution benefit plan expense | $ 4.1 | $ 3.9 | $ 3.9
Defined benefit pension plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions next fiscal year | 17.0 |  |
Settlements | 1.3 |  |
Defined benefit pension plans | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan funded status of plan | $ 0.8 | $ 1.2 |
Discount rate | 5.00% | 5.30% |
Expected long-term rate of return | 5.00% | 4.00% | 4.00%
Defined benefit pension plans | U S | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return | 7.00% |  |
Target asset allocation | 33.00% |  |
Defined benefit pension plans | U S | Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return | 5.00% |  |
Target asset allocation | 59.00% |  |
Defined benefit pension plans | U S | Assets valued at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 98.00% |  |
Defined benefit pension plans | Foreign Pension Plans Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan funded status of plan | $ 141.1 | $ 119.2 |
Discount rate | 3.40% | 3.90% |
Expected long-term rate of return | 4.60% | 2.50% | 2.40%
Defined benefit pension plans | C A | Equity Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 10.00% |  |
Defined benefit pension plans | C A | Debt Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 90.00% |  |
Defined benefit pension plans | C A | Debt Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 100.00% |  |
Defined benefit pension plans | N O | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return | 7.00% |  |
Target asset allocation | 18.00% |  |
Defined benefit pension plans | N O | Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return | 4.00% |  |
Target asset allocation | 63.00% |  |
Defined benefit pension plans | N O | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return | 6.00% |  |
Target asset allocation | 14.00% |  |
Defined benefit pension plans | N O | Other Investment Securities And Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return | 7.00% |  |
Defined benefit pension plans | N O | Real Estate And Other Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actual plan asset allocation | 14.00% |  |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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