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Commitments and contingencies - Lead Pigment Litigation-NL and Environmental Matters and Litigation - Additional Information (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Feb. 10, 2025 USD ($) company | Jul. 24, 2019 USD ($) defendant installment | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) site | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2019 USD ($) | Jul. 25, 2019 USD ($)
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  |  | $ 16,400,000 | $ 11,800,000 |  |  |  |
Long-term litigation settlement |  |  |  |  |  |  |  |  |  | 16,100,000 |  |  |  |
Accrual for reasonably estimable environmental remediation and related matters |  |  |  |  |  |  |  |  | 74,600,000 | 96,900,000 | $ 97,300,000 | $ 97,600,000 |  |
Insurance recoveries |  |  |  |  |  |  |  |  | 1,400,000 | 3,000,000 | 2,800,000 |  |  |
Other Environmental Cleanup Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for reasonably estimable environmental remediation and related matters |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |
Raritan Bay Slag Superfund Site | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount | $ 151,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of private companies to pay to resolve all federal and state law claims | company | 22 |  |  |  |  |  |  |  |  |  |  |  |  |
N L Industries Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate income |  |  |  |  |  |  |  |  | 31,400,000 |  |  |  |  |
Insurance recoveries |  |  |  |  |  |  |  |  | 1,400,000 | 500,000 |  |  |  |
N L Industries Inc | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement Interest |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
Litigation settlement, current |  |  |  |  |  |  |  | 9,600,000 |  |  |  |  |  |
Litigation Settlement, Amount Payable |  |  |  |  |  |  |  | $ 56,100,000 |  |  |  |  |  |
N L Industries Inc | Environmental Remediation Sites NL Named As PRP Or Defendant |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for reasonably estimable environmental remediation and related matters |  |  |  |  |  |  |  |  | $ 69,000,000 |  |  |  |  |
Number of sites associated with remediation and related costs | site |  |  |  |  |  |  |  |  | 30 |  |  |  |  |
Number of sites for which NL not currently able to reasonably estimate range of costs |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
N L Industries Inc | Maximum | Environmental Remediation Sites NL Named As PRP Or Defendant |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upper end range, estimate costs for remediation and related matters |  |  |  |  |  |  |  |  | $ 38,000,000 |  |  |  |  |
C A Lead Paint Litigation | N L Industries Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of defendants |  |  |  |  |  |  |  |  | July 24, 2019, an order approving a global settlement agreement entered into among all of the plaintiffs and the three defendants remaining in the case (the Sherwin Williams Company, ConAgra Grocery Products and NL) was entered by the court and the case was dismissed with prejudice. The global settlement agreement provides that an aggregate $305 million will be paid collectively by the three co-defendants in full satisfaction of all claims resulting in a dismissal of the case with prejudice and the resolution of (i) all pending and future claims by the plaintiffs in the case, and (ii) all potential claims for contribution or indemnity between NL and its co-defendants in respect to the case. |  |  |  |  |
Number of Defendant | defendant |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  | $ 101,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  | 305,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement charge upon approval of settlement terms |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining litigation settlement charge |  | $ 76,700,000 |  |  |  |  |  |  | $ 101,700,000 |  |  |  |  |
Number of annual installment payments | installment |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Litigation payment |  |  | $ 12,000,000 | $ 12,000,000 | $ 12,000,000 | $ 12,000,000 | $ 12,000,000 |  |  |  |  |  |  |
Remaining litigation settlement charge due in first installment |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining litigation settlement charge due in second installment |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining litigation settlement charge due in third installment |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining litigation settlement charge due in fourth installment |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining litigation settlement charge due in fifth installment |  | 12,000,000 | $ 12,000,000 |  |  |  |  |  |  |  |  |  |  |
Remaining litigation settlement charge due in sixth installment |  | $ 16,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Discounted rate for estimated present value of remaining litigation amount |  |  |  |  |  |  |  |  | 1.90% |  |  |  |  |
Long-term litigation settlement |  |  |  |  |  |  |  |  | $ 96,300,000 |  |  |  |  |
Litigation settlement accrual payments |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |
Accretion expense |  |  |  |  |  |  |  |  | $ 500,000 | $ 700,000 | $ 900,000 |  |  |
C A Lead Paint Litigation | N L Industries Inc | Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow deposit |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000

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