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Commitments and Contingencies - Lead Pigment Litigation-NL and Environmental Matters and Litigation - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 24, 2019 USD ($) Defendant Installment | Sep. 30, 2020 USD ($) site | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Cases site | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Litigation settlement |  | $ 11.8 |  |  |  | $ 11.8 |  | $ 11.8
Litigation settlement expense, net |  |  |  | $ (0.3) |  |  | $ 19.3 |
Accrual for reasonably estimable environmental remediation and related matters |  | 98.6 |  |  |  | 98.6 |  | $ 99.7
Insurance recoveries |  |  |  | $ 0.2 |  | 1.6 | 5.2 |
Other Environmental Cleanup Matters |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Accrual for reasonably estimable environmental remediation and related matters |  | 5.0 |  |  |  | 5.0 |  |
NL |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Insurance recoveries |  |  |  |  |  |  | $ 5.2 |
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 |  | $ 94.0 |  |  |  | $ 94.0 |  |
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 |  | $ 114.0 |  |  |  | $ 114.0 |  |
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 |  |
California Lead Paint Litigation | NL |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Settlement amount | $ 305.0 |  |  |  |  |  |  |
Litigation settlement | 101.7 |  |  |  |  |  |  |
Litigation settlement charge upon approval of settlement terms | 25.0 |  |  |  |  |  |  |
Remaining litigation settlement charge | $ 76.7 |  |  |  |  |  |  |
Number of annual installments | Installment | 6 |  |  |  |  |  |  |
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 | 12.0 |  |  |  |  |  |  |
Remaining litigation settlement charge due in fifth installment | 12.0 |  |  |  |  |  |  |
Remaining litigation settlement charge due in sixth installment | $ 16.7 |  |  |  |  |  |  |
Discounted rate for estimated present value of remaining litigation amount | 1.90% |  |  |  |  |  |  |
Litigation settlement expense, net |  |  |  |  | $ 19.3 |  |  |
Initial payment |  |  | $ 25.0 |  |  |  |  |
Annual installment payment |  | $ 12.0 |  |  |  |  |  |

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