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Commitments and Contingencies - Lead Pigment Litigation-NL and Environmental Matters and Litigation - Additional Information (Detail)
$ in Millions
 3 Months Ended
Jul. 24, 2019
USD ($)
Defendant
Installment
Mar. 31, 2020
USD ($)
Cases
site
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Commitments And Contingent Liabilities [Line Items]        
Litigation settlement   $ 11.9   $ 11.8
Accrual for reasonably estimable environmental remediation and related matters   99.1   $ 99.7
Other Environmental Cleanup Matters        
Commitments And Contingent Liabilities [Line Items]        
Accrual for reasonably estimable environmental remediation and related matters   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   $ 94.0    
Number of sites associated with remediation and related costs | site   32    
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   $ 115.0    
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