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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2016
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, |
| 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |
| (In millions) |
Service cost | $ | 2.7 |  |  | $ | 2.5 |  |  | $ | 5.6 |  |  | $ | 5.0 |
Interest cost |  | 4.4 |  |  |  | 4.5 |  |  |  | 9.0 |  |  |  | 8.9 |
Expected return on plan assets |  | (5.3 | ) |  |  | (4.7 | ) |  |  | (10.7 | ) |  |  | (9.2 | )
Amortization if unrecognized prior service cost |  | .2 |  |  |  | .2 |  |  |  | .4 |  |  |  | .4 |
Recognized actuarial losses |  | 3.8 |  |  |  | 3.4 |  |  |  | 7.6 |  |  |  | 6.6 |
Total | $ | 5.8 |  |  | $ | 5.9 |  |  | $ | 11.9 |  |  | $ | 11.7 |
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, |
| 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |
| (In millions) |
Service cost | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |
Interest cost |  | — |  |  |  | — |  |  |  | .2 |  |  |  | .2 |
Amortization of prior service credit |  | (.4 | ) |  |  | (.4 | ) |  |  | (.9 | ) |  |  | (.9 | )
Recognized actuarial gains |  | (.1 | ) |  |  | — |  |  |  | (.1 | ) |  |  | (.1 | )
Total | $ | (.4 | ) |  | $ | (.3 | ) |  | $ | (.7 | ) |  | $ | (.7 | )
Contributions – We expect to contribute the equivalent of $15.8 million and $1.1 million, respectively, to all of our defined benefit pension plans and other postretirement benefit plans during 2016.

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