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Defined Benefit Pension Plans | 9 Months Ended
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Sep. 30, 2020
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 |  |  | Nine months ended |
|  | September 30, |  |  | September 30, |
|  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |
|  | (In millions) |
Service cost |  | $ | 2.7 |  |  | $ | 3.5 |  |  | $ | 8.3 |  |  | $ | 9.9 |
Interest cost |  |  | 4.0 |  |  |  | 3.1 |  |  |  | 11.9 |  |  |  | 9.0 |
Expected return on plan assets |  |  | (3.6 | ) |  |  | (2.9 | ) |  |  | (10.7 | ) |  |  | (8.4 | )
Amortization of prior service cost |  |  | .1 |  |  |  | .1 |  |  |  | .2 |  |  |  | .2 |
Recognized actuarial losses |  |  | 3.7 |  |  |  | 5.0 |  |  |  | 11.2 |  |  |  | 14.4 |
Total |  | $ | 6.9 |  |  | $ | 8.8 |  |  | $ | 20.9 |  |  | $ | 25.1 |
We expect to contribute the equivalent of approximately $19 million to all of our defined benefit pension plans during 2020.

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