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Commitments and Contingencies - Lead Pigment Litigation and Environmental Matters and Litigation - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 24, 2019
USD ($)
Defendant
Installment
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Installment
Dec. 31, 2019
USD ($)
site
Dec. 31, 2019
USD ($)
Cases
Installment
site
Dec. 31, 2018
USD ($)
Nov. 30, 2018
Complaint
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments And Contingent Liabilities [Line Items]                    
Litigation settlement         $ 11.8 $ 11.8 $ 60.0      
Litigation settlement net present value         60.1 60.1 17.0      
Litigation settlement expense, net     $ 19.3 $ 62.0   19.3 62.0      
Current insurance recovery receivable         0.0 0.0 15.0      
Accrual for reasonably estimable environmental remediation and related matters         99.7 99.7 $ 103.4   $ 117.5 $ 122.6
Other Environmental Cleanup Matters                    
Commitments And Contingent Liabilities [Line Items]                    
Accrual for reasonably estimable environmental remediation and related matters         5.2 5.2        
NL                    
Commitments And Contingent Liabilities [Line Items]                    
Number of complaints filed | Complaint               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         $ 94.5 $ 94.5        
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         $ 115.0 $ 115.0        
Lead Pigment Litigation                    
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        
California Lead Paint Litigation                    
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         11.8 $ 11.8        
Litigation settlement due in 2020         12.0 12.0        
Litigation settlement net present value         60.1 60.1        
Insurance recovery receivable noncurrent         15.6 $ 15.6        
Escrow Deposit   $ 9.0                
California Lead Paint Litigation | Aggregate Net Present Value of Five Payments                    
Commitments And Contingent Liabilities [Line Items]                    
Number of remaining annual installments | Installment           5        
California Lead Paint Litigation | NL                    
Commitments And Contingent Liabilities [Line Items]                    
Litigation settlement 101.7     62.0            
Litigation settlement charge upon approval of settlement terms 25.0     45.0            
Remaining litigation settlement charge $ 76.7   101.7 $ 20.0            
Number of annual installments | Installment 6     5            
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                  
Litigation settlement net present value     $ 96.3 $ 17.0            
Litigation settlement, current   0.3   $ 80.0            
Litigation settlement installments payment beginning term from approval       4 years            
Discounted rate for estimated present value of remaining litigation amount     1.90%              
Litigation settlement expense, net     $ 19.6     $ 19.3        
Litigation settlement accrual payments   $ 25.0                
Accretion expense         $ 0.6