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Commitments and contingencies - Lead Pigment Litigation-NL and Environmental Matters and Litigation - Additional Information (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 USD ($) site case | Dec. 31, 2023 USD ($)
Commitments And Contingent Liabilities [Line Items] |  |
Accrual for reasonably estimable environmental remediation and related matters | $ 96,900,000 | $ 96,900,000
Other Environmental Cleanup Matters |  |
Commitments And Contingent Liabilities [Line Items] |  |
Accrual for reasonably estimable environmental remediation and related matters | 5,000,000 |
NL | Environmental Remediation Sites NL Named As PRP Or Defendant |  |
Commitments And Contingent Liabilities [Line Items] |  |
Accrual for reasonably estimable environmental remediation and related matters | $ 92,000,000 |
Number of sites associated with remediation and related costs | 33 |
Number of sites for which NL not currently able to reasonably estimate range of costs | site | 5 |
NL | 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 | $ 118,000,000 |
Lead Pigment Litigation | NL |  |
Commitments And Contingent Liabilities [Line Items] |  |
Period by which loss contingency claims settled and dismissed | 30 years |
Lead Pigment Litigation | NL | Minimum |  |
Commitments And Contingent Liabilities [Line Items] |  |
Number of cases settled and dismissed and found not liable | case | 100 |
C A Lead Paint Litigation | NL |  |
Commitments And Contingent Liabilities [Line Items] |  |
Remaining litigation settlement charge due in sixth installment | $ 16,700,000 |

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