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Commitments and Contingencies - Lead Pigment Litigation-NL and Environmental Matters and Litigation - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 24, 2019 USD ($) Installment | Sep. 30, 2021 USD ($) site | Sep. 30, 2021 USD ($) Cases site | Dec. 31, 2020 USD ($)
Commitments And Contingent Liabilities [Line Items] |  |  |  |
Accrual for reasonably estimable environmental remediation and related matters |  | $ 97.8 | $ 97.8 | $ 98.6
Other Environmental Cleanup Matters |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |
Accrual for reasonably estimable environmental remediation and related matters |  | 5.0 | 5.0 |
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 |  | $ 93.0 | $ 93.0 |
Number of sites associated with remediation and related costs | site |  | 32 | 32 |
Number of sites for which NL not currently able to reasonably estimate range of costs | site |  | 5 | 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 |  | $ 112.0 | $ 112.0 |
Lead Pigment Litigation | NL |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |
Number of cases settled and dismissed and found not liable | Cases |  |  | 100 |
Period by which loss contingency claims settled and dismissed |  |  | 30 years |
C A Lead Paint Litigation | NL |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |
Number of annual installment payments | Installment | 4 |  |  |
Litigation payment |  | $ 12.0 |  |
Remaining litigation settlement charge due in first installment | $ 12.0 |  |  |
Remaining litigation settlement charge due in second installment | 12.0 |  |  |
Remaining litigation settlement charge due in third installment | 12.0 |  |  |
Remaining litigation settlement charge due in fourth installment | $ 16.7 |  |  |

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