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Investment in Kronos Worldwide, Inc. (Tables) | 9 Months Ended
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Sep. 30, 2025
Investment in Kronos Worldwide, Inc. |
Schedule of Changes in Carrying Value of Investment | ​
​ | ​ | ​ | ​
​ |  | Amount
​ | ​ | (In millions)
Balance at the beginning of the period | ​ | $ | 250.3
Equity in losses of Kronos | ​ |  | (8.6)
Dividends received from Kronos | ​ |  | (5.3)
Equity in Kronos' other comprehensive income: | ​ | ​ | ​
Currency translation | ​ | ​ | 9.7
Defined benefit pension plans | ​ | ​ | .4
Balance at the end of the period | ​ | $ | 246.5
Schedule of Selected Financial Information of Kronos Balance Sheet | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | September 30,
​ |  | 2024 |  | 2025
​ | ​ | (In millions)
Current assets | ​ | $ | 1,105.3 | ​ | $ | 1,070.4
Property and equipment, net | ​ |  | 694.1 | ​ |  | 725.7
Other noncurrent assets | ​ |  | 114.1 | ​ |  | 113.6
Total assets | ​ | $ | 1,913.5 | ​ | $ | 1,909.7
​ | ​ | ​ | ​ | ​ | ​ | ​
Current liabilities | ​ | $ | 476.6 | ​ | $ | 279.2
Long-term debt | ​ |  | 429.1 | ​ |  | 626.2
Accrued pension costs | ​ |  | 117.5 | ​ |  | 125.2
Other noncurrent liabilities | ​ |  | 73.3 | ​ |  | 74.4
Stockholders’ equity | ​ |  | 817.0 | ​ |  | 804.7
Total liabilities and stockholders’ equity | ​ | $ | 1,913.5 | ​ | $ | 1,909.7
Schedule of Selected Financial Information of Kronos Income Statement | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2024 |  | 2025 |  | 2024 |  | 2025
​ | ​ | (In millions)
Net sales | ​ | $ | 484.7 | ​ | $ | 456.9 | ​ | $ | 1,464.0 | ​ | $ | 1,441.1
Cost of sales | ​ |  | 383.5 | ​ |  | 409.9 | ​ |  | 1,191.1 | ​ |  | 1,224.5
Income from operations | ​ |  | 38.9 | ​ |  | (19.2) | ​ |  | 94.3 | ​ |  | 26.6
Income tax expense | ​ |  | 22.7 | ​ |  | 7.9 | ​ |  | 34.7 | ​ |  | 19.0
Net income (loss) | ​ |  | 71.8 | ​ |  | (37.0) | ​ |  | 99.4 | ​ |  | (28.1)

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