Commitments and Contingencies - Lead Pigment Litigation-NL and Environmental Matters and Litigation - Additional Information (Detail) $ in Millions		3 Months Ended		6 Months Ended
	Jul. 24, 2019 USD ($) Defendant Installment	Jun. 30, 2019 USD ($) site	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Cases Installment site	Jun. 30, 2018 USD ($) Installment	Dec. 31, 2018 USD ($)	Nov. 30, 2018 Complaint
Commitments And Contingent Liabilities [Line Items]
Litigation settlement		$ 25.0		$ 25.0		$ 60.0
Litigation settlement net present value		71.6		71.6		17.0
Litigation settlement expense, net		19.6	$ 62.0	19.6	$ 62.0
Accrued litigation settlement		71.6		71.6		17.0
Insurance recovery receivable noncurrent		15.6		15.6
Current insurance recovery receivable		15.6		15.6		15.0
Accrual for reasonably estimable environmental remediation and related matters		102.1		102.1		$ 103.4
Other Environmental Cleanup Matters
Commitments And Contingent Liabilities [Line Items]
Accrual for reasonably estimable environmental remediation and related matters		5.1		5.1
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		$ 97.0		$ 97.0
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		$ 117.0		$ 117.0
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
Commitments And Contingent Liabilities [Line Items]
Litigation settlement		25.0		$ 25.0
Litigation settlement net present value		71.6		71.6
Accrued litigation settlement		71.6		71.6
Insurance recovery receivable noncurrent		15.6		15.6
Insurance recovery receivable previously recognized		15.0		15.0
Accrued interest receivable		0.6		$ 0.6
California Lead Paint Litigation | Aggregate Net Present Value of Five Payments
Commitments And Contingent Liabilities [Line Items]
Number of annual installments | Installment				6
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 us) 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 us and our co-defendants in respect to the case.
Litigation settlement			62.0		62.0
Litigation settlement charge upon approval of settlement terms			45.0		45.0
Remaining litigation settlement charge		76.7	20.0	$ 76.7	$ 20.0
Number of annual installments | Installment				6	5
Remaining litigation settlement charge due in first installment		12.0		$ 12.0
Remaining litigation settlement charge due in second installment		12.0		12.0
Remaining litigation settlement charge due in third installment		12.0		12.0
Remaining litigation settlement charge due in fourth installment		12.0		12.0
Remaining litigation settlement charge due in fifth installment		12.0		12.0
Remaining litigation settlement charge due in sixth installment		16.7		16.7
Litigation settlement, current					$ 80.0
Litigation settlement net present value		$ 71.6	17.0	$ 71.6	$ 17.0
Litigation settlement installments payment beginning term from approval					4 years
Discounted rate for estimated present value of remaining litigation amount		1.90%		1.90%
Litigation settlement expense, net				$ 19.6
Litigation settlement accrual payments		$ 96.6	77.0	96.6	$ 77.0
Accrued litigation settlement		$ 71.6	$ 17.0	$ 71.6	$ 17.0
California Lead Paint Litigation | NL | Subsequent Event [Member]
Commitments And Contingent Liabilities [Line Items]
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