Commitments and contingencies - Other Litigation and Other Matters - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) customer	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2025 USD ($)
Component Products Segment | Customer Concentration Risk | Top Ten Customers | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	47.00%	52.00%	52.00%
Component Products [Member] | Customer Concentration Risk | One customer | Net Sales | Security Products Reporting Unit
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	21.00%	24.00%	14.00%
Component Products [Member] | Customer Concentration Risk | One customer | Net Sales | Security Products Reporting Unit | Pilot project
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage		11.00%
Component Products [Member] | Customer Concentration Risk | One customer | Net Sales | Marine Components Reporting Unit
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage			12.00%
TiO2 | Chemicals
Commitments And Contingent Liabilities [Line Items]
Number of customers | customer	3,000
TiO2 | Chemicals | Product Concentration Risk [Member] | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	90.00%	90.00%	92.00%
TiO2 | Chemicals | Customer Concentration Risk | Top Ten Customers | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	39.00%	35.00%	33.00%
TiO2 | Chemicals | Customer Concentration Risk | One customer | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	10.00%	12.00%	10.00%
TiO2 | Chemicals | Geographic Concentration Risk | Europe | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	44.00%	44.00%	45.00%
TiO2 | Chemicals | Geographic Concentration Risk | North America | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	40.00%	41.00%	39.00%
Feedstock Ore | Chemicals
Commitments And Contingent Liabilities [Line Items]
Minimum purchase commitments				$ 542,000.0
Purchase obligation due in next fiscal year				$ 484.0
Other Supply And Service Contracts | Chemicals
Commitments And Contingent Liabilities [Line Items]
Minimum purchase commitments	$ 67.0
Purchase obligation due in next fiscal year	$ 40.0
Land Sales [Member] | Real Estate Management And Development [Member] | Customer Concentration Risk | One customer | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	10.00%	10.00%
Land Sales [Member] | Real Estate Management And Development [Member] | Customer Concentration Risk | One customer | Net Sales | Minimum [Member]
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage			10.00%
Land Sales [Member] | Real Estate Management And Development [Member] | Customer Concentration Risk | Second Customer | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	10.00%	10.00%
Land Sales [Member] | Real Estate Management And Development [Member] | Customer Concentration Risk | Second Customer | Net Sales | Minimum [Member]
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage			10.00%
Land Sales [Member] | Real Estate Management And Development [Member] | Customer Concentration Risk | Third Customer | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage	10.00%	10.00%
Land Sales [Member] | Real Estate Management And Development [Member] | Customer Concentration Risk | Four customer | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage		10.00%
Land Sales [Member] | Real Estate Management And Development [Member] | Customer Concentration Risk | Five customer | Net Sales
Commitments And Contingent Liabilities [Line Items]
Concentration risk percentage		10.00%