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Defined benefit pension plans | 6 Months Ended
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Jun. 30, 2024
Defined benefit pension plans |
Defined benefit pension plans | Note 11 – Defined benefit pension plans: The components of our net periodic defined benefit pension cost are presented in the table below.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2023 |  | 2024 |  | 2023 |  | 2024
​ | ​ | (In millions)
Service cost | ​ | $ | 1.5 | ​ | $ | 1.6 | ​ | $ | 3.1 | ​ | $ | 3.3
Interest cost | ​ | ​ | 5.5 | ​ | ​ | 5.2 | ​ | ​ | 11.1 | ​ | ​ | 10.6
Expected return on plan assets | ​ |  | (5.2) | ​ |  | (5.6) | ​ |  | (10.4) | ​ |  | (11.2)
Recognized net actuarial losses | ​ |  | 1.0 | ​ |  | 1.0 | ​ |  | 1.9 | ​ |  | 1.9
Settlements | ​ | ​ | 6.2 | ​ | ​ | — | ​ | ​ | 6.2 | ​ | ​ | —
Total | ​ | $ | 9.0 | ​ | $ | 2.2 | ​ | $ | 11.9 | ​ | $ | 4.6
​ In the second quarter of 2023, we completed a termination and buy-out of our United Kingdom pension plan resulting in a $6.2 million settlement loss. We expect to contribute the equivalent of approximately $18 million to all of our defined benefit pension plans during 2024.

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