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Employee benefit plans | 3 Months Ended
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Mar. 31, 2013
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 March 31, |
|  | 2012 |  |  | 2013 |
|  | (In millions) |
Service cost |  | $ | 2.6 |  |  | $ | 3.3 |
Interest cost |  |  | 6.4 |  |  |  | 6.1 |
Expected return on plan assets |  |  | (5.5 | ) |  |  | (6.1 | )
Amortization of unrecognized: |  |  |  |  |  |  |  |
Prior service cost |  |  | .4 |  |  |  | .4 |
Net transition obligations |  |  | .1 |  |  |  | .1 |
Actuarial losses |  |  | 2.3 |  |  |  | 3.4 |
Total |  | $ | 6.3 |  |  | $ | 7.2 |
Other postretirement benefits – The components of our net periodic other postretirement benefit cost are presented in the table below.
|  | Three months ended March 31, |
|  | 2012 |  |  | 2013 |
|  | (In millions) |
Service cost |  | $ | .1 |  |  | $ | .1 |
Interest cost |  |  | .2 |  |  |  | .2 |
Amortization of prior service credit |  |  | (.5 | ) |  |  | (.5 | )
Total |  | $ | (.2 | ) |  | $ | (.2 | )
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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