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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2017
Compensation And Retirement Disclosure [Abstract] |
Employee Benefit Plans | Note 11—Employee benefit plans: Defined 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, |
| 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |
| (In millions) |
Service cost | $ | 2.5 |  |  | $ | 2.8 |  |  | $ | 5.0 |  |  | $ | 5.5 |
Interest cost |  | 4.5 |  |  |  | 3.9 |  |  |  | 8.9 |  |  |  | 7.7 |
Expected return on plan assets |  | (4.7 | ) |  |  | (3.2 | ) |  |  | (9.2 | ) |  |  | (6.4 | )
Amortization of unrecognized prior service cost |  | .2 |  |  |  | .1 |  |  |  | .4 |  |  |  | .2 |
Recognized actuarial losses |  | 3.4 |  |  |  | 3.7 |  |  |  | 6.6 |  |  |  | 7.3 |
Total | $ | 5.9 |  |  | $ | 7.3 |  |  | $ | 11.7 |  |  | $ | 14.3 |
Other postretirement benefits – 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, |
| 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |
| (In millions) |
Service cost | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |
Interest cost |  | — |  |  |  | .1 |  |  |  | .2 |  |  |  | .2 |
Amortization of prior service credit |  | (.4 | ) |  |  | (.3 | ) |  |  | (.9 | ) |  |  | (.5 | )
Recognized actuarial gains |  | — |  |  |  | — |  |  |  | (.1 | ) |  |  | (.1 | )
Total | $ | (.3 | ) |  | $ | (.1 | ) |  | $ | (.7 | ) |  | $ | (.3 | )
Contributions – We expect to contribute the equivalent of $16.0 million and $1.1 million, respectively, to all of our defined benefit pension plans and other postretirement benefit plans during 2017.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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