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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract] |
Employee Benefit Plans | Note 12—Employee benefit 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, |
| 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |
| (In millions) |
Service cost | $ | 2.8 |  |  | $ | 2.9 |  |  | $ | 5.5 |  |  | $ | 5.9 |
Interest cost |  | 3.9 |  |  |  | 4.0 |  |  |  | 7.7 |  |  |  | 8.0 |
Expected return on plan assets |  | (3.2 | ) |  |  | (3.8 | ) |  |  | (6.4 | ) |  |  | (7.8 | )
Amortization of unrecognized prior service cost |  | .1 |  |  |  | — |  |  |  | .2 |  |  |  | .1 |
Recognized actuarial losses |  | 3.7 |  |  |  | 3.9 |  |  |  | 7.3 |  |  |  | 7.7 |
Total | $ | 7.3 |  |  | $ | 7.0 |  |  | $ | 14.3 |  |  | $ | 13.9 |
The components of our net periodic other postretirement benefit cost are presented in the table below.
| Three months ended June 30, |  |  | Six months ended June 30, |
| 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |
| (In millions) |
Service cost | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |
Interest cost |  | .1 |  |  |  | — |  |  |  | .2 |  |  |  | .1 |
Amortization of prior service credit |  | (.3 | ) |  |  | (.2 | ) |  |  | (.5 | ) |  |  | (.5 | )
Recognized actuarial gains |  | — |  |  |  | (.1 | ) |  |  | (.1 | ) |  |  | (.1 | )
Total | $ | (.1 | ) |  | $ | (.2 | ) |  | $ | (.3 | ) |  | $ | (.4 | )
Upon the adoption of ASU 2017-07, Compensation— Retirement Benefits (Topic 715) Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, our net periodic defined benefit pension cost and other postretirement benefit cost, other than the service cost component, is presented as a separate line item (“Other components of net periodic pension and OPEB expense”) in our Condensed Consolidated Statements of Income for all periods presented. See Note 19. We expect to contribute the equivalent of approximately $19.8 million and $1.0 million, respectively, to all of our defined benefit pension plans and other postretirement benefit plans during 2018.

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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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