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Defined contribution and defined benefit retirement plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jul. 16, 2024
Defined benefit pension plans [Line Items] |  |  |  |  |
Non cash defined benefit plan termination loss |  |  | $ 6.2 |  |
Defined contribution plan expense |  | $ 7.7 | 8.2 | $ 8.0 |
Defined Benefit Pension Plans |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Non cash defined benefit plan termination loss | $ 6.2 |  |  |  |
Expected contribution |  | 16.0 |  |  |
Expect to recognize unrecognized actuarial gains (losses) |  | 0.1 | 3.2 |  |
Defined Benefit Pension Plans | Louisiana Pigment Company |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Net pension asset |  |  |  |  | $ 10.6
Defined Benefit Pension Plans | Non U.S. |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Net overfunded status |  | $ (108.4) | $ (141.1) |  |
Discount rate |  | 3.60% | 3.40% |  |
Long-term return on plan assets |  | 4.90% | 4.60% | 2.50% |
Defined Benefit Pension Plans | Canada | Equity Securities | Minimum [Member] |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Percentage of plan asset allocation |  | 10.00% |  |  |
Defined Benefit Pension Plans | Canada | Fixed Income Funds |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Percentage of plan asset allocation |  | 51.00% |  |  |
Defined Benefit Pension Plans | Canada | Fixed Income Funds | Minimum [Member] |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Percentage of plan asset allocation |  | 90.00% |  |  |
Defined Benefit Pension Plans | Canada | Fixed Income Funds | Maximum [Member] |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Percentage of plan asset allocation |  | 100.00% |  |  |
Defined Benefit Pension Plans | Norway | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Percentage of plan asset allocation |  | 15.00% |  |  |
Defined Benefit Pension Plans | Norway | Equity Securities |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Long-term return on plan assets |  | 7.00% |  |  |
Percentage of plan asset allocation |  | 18.00% |  |  |
Defined Benefit Pension Plans | Norway | Fixed Income Funds |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Percentage of plan asset allocation |  | 63.00% |  |  |
Defined Benefit Pension Plans | Norway | Real Estate. |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Long-term return on plan assets |  | 7.00% |  |  |
Percentage of plan asset allocation |  | 14.00% |  |  |
Defined Benefit Pension Plans | Norway | Other Investments And Liquid Funds |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Long-term return on plan assets |  | 8.00% |  |  |
Defined Benefit Pension Plans | United States |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Net overfunded status |  | $ 10.5 | $ (2.4) |  |
Discount rate |  | 5.50% | 5.00% |  |
Long-term return on plan assets |  | 5.00% | 5.00% | 4.00% |
Defined Benefit Pension Plans | United States | Equity Securities |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Long-term return on plan assets |  | 7.00% |  |  |
Percentage of plan asset allocation |  | 17.00% |  |  |
Defined Benefit Pension Plans | United States | Fixed Income Funds |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Long-term return on plan assets |  | 5.00% |  |  |
Percentage of plan asset allocation |  | 80.00% |  |  |

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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 included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of contributions received and expected to be received by defined benefit plan from employer in 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/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + 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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