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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2013
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, |
--- | --- | --- | --- | --- | ---
| 2012 |  |  | 2013 |  |  | 2012 |  |  | 2013 |
| (In millions) |
Service cost | $ |  | 2.6 |  |  | $ |  | 3.2 |  |  | $ |  | 5.2 |  |  | $ |  | 6.5 |
Interest cost |  | 6.5 |  |  |  | 5.8 |  |  |  | 12.9 |  |  |  | 11.9 |
Expected return on plan assets |  | (5.5 | ) |  |  | (5.9 | ) |  |  | (11.0 | ) |  |  | (12.0 | )
Amortization of unrecognized: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  | .4 |  |  |  | .4 |  |  |  | .8 |  |  |  | .8 |
Net transition obligations |  | .1 |  |  |  | .1 |  |  |  | .2 |  |  |  | .2 |
Actuarial losses |  | 2.3 |  |  |  | 3.4 |  |  |  | 4.6 |  |  |  | 6.8 |
Total | $ |  | 6.4 |  |  | $ |  | 7.0 |  |  | $ |  | 12.7 |  |  | $ |  | 14.2 |
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, |
--- | --- | --- | --- | --- | ---
| 2012 |  |  | 2013 |  |  | 2012 |  |  | 2013 |
| (In millions) |  |  | (In millions) |
Service cost | $ |  | — |  |  | $ |  | .1 |  |  | $ |  | .1 |  |  | $ |  | .2 |
Interest cost |  | .3 |  |  |  | . 1 |  |  |  | .5 |  |  |  | .3 |
Amortization of prior service credit |  | (.4 | ) |  |  | (.4 | ) |  |  | (.9 | ) |  |  | (.9 | )
Total | $ |  | (.1 | ) |  | $ |  | (.2 | ) |  | $ |  | (.3 | ) |  | $ |  | (.4 | )
Contributions – We expect to contribute the equivalent of $28.5 million and $1.6 million, respectively, to all of our defined benefit pension plans and other postretirement benefit plans during 2013.

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