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Employee Benefit Plans | 9 Months Ended
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Sep. 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 September 30, |  |  | Nine months ended September 30, |
| 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |
| (In millions) |
Service cost | $ | 2.8 |  |  | $ | 2.5 |  |  | $ | 8.4 |  |  | $ | 7.5 |
Interest cost |  | 4.4 |  |  |  | 4.5 |  |  |  | 13.4 |  |  |  | 13.4 |
Expected return on plan assets |  | (5.2 | ) |  |  | (4.6 | ) |  |  | (15.9 | ) |  |  | (13.8 | )
Amortization of unrecognized prior service cost |  | .2 |  |  |  | .1 |  |  |  | .6 |  |  |  | .2 |
Recognized actuarial losses |  | 3.7 |  |  |  | 3.3 |  |  |  | 11.3 |  |  |  | 10.2 |
Total | $ | 5.9 |  |  | $ | 5.8 |  |  | $ | 17.8 |  |  | $ | 17.5 |
Other postretirement benefits – The components of our net periodic other postretirement benefit cost are presented in the table below.
| Three months ended September 30, |  |  | Nine months ended September 30, |
| 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |
| (In millions) |
Service cost | $ | — |  |  | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |
Interest cost |  | .2 |  |  |  | .2 |  |  |  | .4 |  |  |  | .4 |
Amortization of prior service credit |  | (.5 | ) |  |  | (.5 | ) |  |  | (1.4 | ) |  |  | (1.4 | )
Recognized actuarial gains |  | — |  |  |  | (.1 | ) |  |  | (.1 | ) |  |  | (.1 | )
Total | $ | (.3 | ) |  | $ | (.3 | ) |  | $ | (1.0 | ) |  | $ | (1.0 | )
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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