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Defined Benefit Pension Plans | 6 Months Ended
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Jun. 30, 2021
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, |
| 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |
| (In millions) |
Service cost | $ | 3.2 |  |  | $ | 3.6 |  |  | $ | 6.4 |  |  | $ | 7.4 |
Interest cost |  | 3.0 |  |  |  | 2.4 |  |  |  | 5.9 |  |  |  | 4.8 |
Expected return on plan assets |  | (2.8 | ) |  |  | (3.4 | ) |  |  | (5.5 | ) |  |  | (6.8 | )
Amortization of prior service cost |  | .1 |  |  |  | .1 |  |  |  | .1 |  |  |  | .1 |
Recognized actuarial losses |  | 4.7 |  |  |  | 5.6 |  |  |  | 9.4 |  |  |  | 11.0 |
Total | $ | 8.2 |  |  | $ | 8.3 |  |  | $ | 16.3 |  |  | $ | 16.5 |
We expect to contribute the equivalent of approximately $18 million to all of our defined benefit pension plans during 2021.

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