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Defined Benefit Pension Plans | 6 Months Ended
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Jun. 30, 2022
Compensation And Retirement Disclosure [Abstract] |
Defined Benefit Pension Plans | Note 10 – 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,
​ |  | 2021 |  | 2022 |  | 2021 |  | 2022
​ | ​ | (In millions)
Service cost | ​ | $ | 3.6 | ​ | $ | 2.9 | ​ | $ | 7.4 | ​ | $ | 5.9
Interest cost | ​ | ​ | 2.4 | ​ | ​ | 3.0 | ​ | ​ | 4.8 | ​ | ​ | 6.2
Expected return on plan assets | ​ |  | (3.4) | ​ |  | (3.4) | ​ |  | (6.8) | ​ |  | (6.9)
Amortization of prior service cost | ​ | ​ | .1 | ​ | ​ | — | ​ | ​ | .1 | ​ | ​ | —
Recognized actuarial losses | ​ |  | 5.6 | ​ |  | 3.7 | ​ |  | 11.0 | ​ |  | 7.5
Total | ​ | $ | 8.3 | ​ | $ | 6.2 | ​ | $ | 16.5 | ​ | $ | 12.7
​ We expect to contribute the equivalent of approximately $20 million to all of our defined benefit pension plans during 2022.

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