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Defined benefit pension plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Defined Benefit Pension Plans |
Defined benefit pension plans [Line Items] |
Schedule of Components of Net Periodic Defined Benefit Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2024 |  | 2025 |  | 2024 |  | 2025
​ | ​ | (In millions)
Service cost | ​ | $ | 1.6 | ​ | $ | 1.5 | ​ | $ | 4.9 | ​ | $ | 4.4
Interest cost | ​ | ​ | 5.3 | ​ | ​ | 6.0 | ​ | ​ | 15.9 | ​ | ​ | 17.3
Expected return on plan assets | ​ |  | (5.5) | ​ |  | (6.1) | ​ |  | (16.7) | ​ |  | (17.5)
Recognized net actuarial losses | ​ |  | 1.0 | ​ |  | .8 | ​ |  | 2.9 | ​ |  | 2.4
Total | ​ | $ | 2.4 | ​ | $ | 2.2 | ​ | $ | 7.0 | ​ | $ | 6.6

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