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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 |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) site | May 31, 2018 USD ($) Installment | Jun. 30, 2018 USD ($) Installment | Sep. 30, 2018 USD ($) Cases Installment site | Aug. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |
Litigation settlement net present value | $ 17.0 |  |  | $ 17.0 |  |
Current insurance recovery receivable | 15.0 |  |  | 15.0 |  |
Accrual for reasonably estimable environmental remediation and related matters | 116.7 |  |  | 116.7 |  | $ 117.5
Other Environmental Cleanup Matters |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |
Accrual for reasonably estimable environmental remediation and related matters | 5.7 |  |  | 5.7 |  |
NL |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |
Recalculated abatement fund amount |  |  |  |  | $ 409.0 |
Settlement of recalculated abatement fund amount | 409.0 |  |  |  |  |
Recalculated abatement fund amount undetermined |  |  |  |  | 409.0 |
Current insurance recovery receivable | 15.0 |  |  | 15.0 |  |
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 | $ 111.0 |  |  | $ 111.0 |  |
Number of sites associated with remediation and related costs | site | 37 |  |  | 37 |  |
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 | $ 130.0 |  |  | $ 130.0 |  |
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 |  |  |  | 20 years |  |
Settlement agreement amount |  | $ 80.0 | $ 45.0 |  |  |
Settlement agreement amount to be paid |  | 65.0 | 62.0 |  |  |
Litigation settlement charge upon trial court's approval |  | $ 45.0 | $ 45.0 |  |  |
Number of annual installments | Installment |  | 5 | 5 | 5 |  |
Litigation settlement installments payment beginning term from approval |  | 4 years | 4 years |  |  |
Remaining litigation settlement charge | $ 20.0 | $ 20.0 | $ 20.0 | $ 20.0 |  |
Remaining litigation settlement charge due in first installment |  | 6.0 |  |  |  |
Remaining litigation settlement charge due in second installment |  | 5.0 |  |  |  |
Remaining litigation settlement charge due in third installment |  | 3.0 |  |  |  |
Remaining litigation settlement charge due in fourth installment |  | 3.0 |  |  |  |
Remaining litigation settlement charge due in fifth installment |  | 3.0 |  |  |  |
Discounted rate for estimated present value of remaining litigation amount | 3.00% |  |  | 3.00% |  |
Litigation settlement net present value | $ 17.0 |  | 17.0 | $ 17.0 |  |
Current insurance recovery receivable |  |  | $ 15.0 |  |  |
Lead Pigment Litigation | NL | NL Former Insurance Carriers |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |
Settlement agreement amount to be paid |  | $ 15.0 |  |  |  |
California Lead Paint Litigation | NL |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |
Amount awarded to the plaintiff |  |  |  | $ 1,150.0 |  |
Lead Pigment Litigation Plaintiffs |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |
Proposed abatement fund amount |  |  |  |  | $ 730.0 |

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