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Other noncurrent liabilities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Other noncurrent liabilities |
Components of Other noncurrent liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ |  | 2022 |  | 2023
​ | ​ | (In millions)
Accrued postretirement benefits | ​ | $ | 5.9 | ​ | $ | 6.4
Employee benefits | ​ |  | 4.8 | ​ |  | 4.9
Other | ​ |  | 9.8 | ​ |  | 10.5
Total | ​ | $ | 20.5 | ​ | $ | 21.8
​

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