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Commitments and contingencies - Lead Pigment Litigation-NL and Environmental Matters and Litigation - Additional Information (Details) $ in Millions	1 Months Ended		3 Months Ended
	Oct. 31, 2025 USD ($)	Feb. 28, 2025 USD ($) company	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2025 USD ($) site
Commitments and contingencies
Accrual for reasonably estimable environmental remediation and related matters				$ 74.6	$ 18.1
Other Environmental Cleanup Matters
Commitments and contingencies
Accrual for reasonably estimable environmental remediation and related matters					5.0
Raritan Bay Slag Superfund Site
Commitments and contingencies
Number of private companies to pay to resolve all federal and state law claims | company		22
Settlement amount		$ 151.1
NL Industries
Commitments and contingencies
Litigation payment			$ 56.1
Litigation settlement interest expense (income)			0.5
Litigation settlement, current			$ 9.6
Aggregate income				$ 31.4
NL Industries | Subsequent event
Commitments and contingencies
Final installment payment	$ 16.7
Litigation settlement interest expense (income)	$ 1.6
NL Industries | Environmental Remediation Sites NL Named As PRP Or Defendant
Commitments and contingencies
Accrual for reasonably estimable environmental remediation and related matters					$ 13.0
Number of sites associated with remediation and related costs | site					29
Number of sites for which NL not currently able to reasonably estimate range of costs | site					5
NL Industries | Maximum | Environmental Remediation Sites NL Named As PRP Or Defendant
Commitments and contingencies
Upper end range, estimate costs for remediation and related matters					$ 38.0

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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