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Defined Benefit Pension Plans | 6 Months Ended
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Jun. 30, 2019
Compensation And Retirement Disclosure [Abstract] |
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 June 30, |  |  | Six months ended June 30, |
| 2018 |  |  | 2019 |  |  | 2018 |  |  | 2019 |
| (In millions) |
Service cost | $ | 2.9 |  |  | $ | 2.8 |  |  | $ | 5.9 |  |  | $ | 5.6 |
Interest cost |  | 4.0 |  |  |  | 4.0 |  |  |  | 8.0 |  |  |  | 8.0 |
Expected return on plan assets |  | (3.8 | ) |  |  | (3.5 | ) |  |  | (7.8 | ) |  |  | (7.2 | )
Amortization of unrecognized prior service cost |  | — |  |  |  | — |  |  |  | .1 |  |  |  | .1 |
Recognized actuarial losses |  | 3.9 |  |  |  | 3.7 |  |  |  | 7.7 |  |  |  | 7.5 |
Total | $ | 7.0 |  |  | $ | 7.0 |  |  | $ | 13.9 |  |  | $ | 14.0 |
We expect to contribute the equivalent of approximately $18.2 million to all of our defined benefit pension plans during 2019.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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