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Accounts payable and accrued liabilities | 12 Months Ended
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Dec. 31, 2023
Payables And Accruals [Abstract] |
Accounts payable and accrued liabilities | Note 10 – Accounts payable and accrued liabilities: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2023
​ | ​ | (In millions)
Accounts payable: |  | ​ |  |  | ​ |
Kronos | ​ | $ | 177.2 | ​ | $ | 218.7
CompX | ​ |  | 3.5 | ​ |  | 3.1
BMI/LandWell | ​ |  | 18.7 | ​ |  | 6.7
Total | ​ | $ | 199.4 | ​ | $ | 228.5
​ | ​ | ​ | ​ | ​ | ​ | ​
Current accrued liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Deferred income | ​ | $ | 110.7 | ​ | $ | 88.8
Employee benefits | ​ | ​ | 34.4 | ​ | ​ | 36.2
Accrued sales discounts and rebates | ​ |  | 25.6 | ​ |  | 22.5
Accrued development costs | ​ | ​ | 5.6 | ​ | ​ | 15.1
Interest | ​ |  | 4.9 | ​ |  | 5.1
Operating lease liabilities | ​ |  | 3.8 | ​ |  | 3.9
Environmental remediation and related costs | ​ |  | 3.8 | ​ |  | 3.7
Other | ​ |  | 54.8 | ​ |  | 45.0
Total | ​ | $ | 243.6 | ​ | $ | 220.3
​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent accrued liabilities: | ​ |  |  | ​ |  |
Accrued development costs | ​ | $ | 48.1 | ​ | $ | 42.3
Operating lease liabilities | ​ |  | 17.4 | ​ |  | 18.6
Deferred income | ​ | ​ | 25.9 | ​ | ​ | 15.5
Insurance claims and expenses | ​ |  | 18.7 | ​ |  | 14.9
Other postretirement benefits | ​ | ​ | 7.1 | ​ | ​ | 7.4
Employee benefits | ​ |  | 4.8 | ​ |  | 4.9
Reserve for uncertain tax positions | ​ |  | .3 | ​ |  | —
Other | ​ |  | 6.7 | ​ |  | 7.8
Total | ​ | $ | 129.0 | ​ | $ | 111.4
​ The risks associated with certain of our accrued insurance claims and expenses have been reinsured, and the related IBNR receivables are recognized as noncurrent assets to the extent the related liability is classified as a noncurrent liability. See Note 7. Our reserve for uncertain tax positions is discussed in Note 14.

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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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