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Commitments and contingencies (Tables) | 12 Months Ended
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Dec. 31, 2024
Commitments and contingencies |
Summary of the activity in our accrued environmental costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2022 |  | 2023 |  | 2024
​ | ​ | (In millions)
Balance at the beginning of the year | ​ | $ | 97.6 | ​ | $ | 97.3 | ​ | $ | 96.9
Additions (deductions), net | ​ |  | 1.7 | ​ |  | 2.5 | ​ |  | (19.2)
Payments, net | ​ |  | (2.0) | ​ |  | (2.9) | ​ |  | (3.1)
Balance at the end of the year | ​ | $ | 97.3 | ​ | $ | 96.9 | ​ | $ | 74.6
Amounts recognized in the Consolidated Balance Sheet at the end of the year: | ​ |  |  | ​ |  |  | ​ |  |
Current liabilities | ​ | $ | 3.8 | ​ | $ | 3.7 | ​ | $ | 59.7
Noncurrent liabilities | ​ |  | 93.5 | ​ |  | 93.2 | ​ |  | 14.9
Total | ​ | $ | 97.3 | ​ | $ | 96.9 | ​ | $ | 74.6
Schedule of approximate percentage of TiO2 sales by volume for segments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2023 |  | 2024 |
Europe |  | 45% | ​ | 44% | ​ | 44% | ​
North America |  | 39% | ​ | 41% | ​ | 40% | ​

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