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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% |  |

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