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Employee benefit plans | 9 Months Ended
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Sep. 30, 2012
Employee benefit plans | Note 10 - 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, |
|  | 2011 |  |  | 2012 |  |  | 2011 |  |  | 2012 |
|  | (In millions) |
Service cost |  | $ | 2.8 |  |  | $ | 2.5 |  |  | $ | 8.3 |  |  | $ | 7.7 |
Interest cost |  |  | 6.9 |  |  |  | 6.2 |  |  |  | 20.5 |  |  |  | 19.1 |
Expected return on plan assets |  |  | (5.8 | ) |  |  | (5.5 | ) |  |  | (17.2 | ) |  |  | (16.5 | )
Amortization of unrecognized: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | .3 |  |  |  | .4 |  |  |  | 1.1 |  |  |  | 1.2 |
Net transition obligations |  |  | .2 |  |  |  | .1 |  |  |  | .4 |  |  |  | .3 |
Recognized actuarial losses |  |  | 1.9 |  |  |  | 2.3 |  |  |  | 5.6 |  |  |  | 6.9 |
Total |  | $ | 6.3 |  |  | $ | 6.0 |  |  | $ | 18.7 |  |  | $ | 18.7 |
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, |
|  | 2011 |  |  | 2012 |  |  | 2011 |  |  | 2012 |
|  | (In millions) |
Service cost |  | $ | .1 |  |  | $ | .1 |  |  | $ | .2 |  |  | $ | .2 |
Interest cost |  |  | .2 |  |  |  | .1 |  |  |  | .7 |  |  |  | .6 |
Amortization of prior service credit |  |  | (.6 | ) |  |  | (.5 | ) |  |  | (1.7 | ) |  |  | (1.4 | )
Recognized actuarial losses |  |  | — |  |  |  | .1 |  |  |  | — |  |  |  | .1 |
Total |  | $ | (.3 | ) |  | $ | (.2 | ) |  | $ | (.8 | ) |  | $ | (.5 | )
Contributions - We expect to contribute the equivalent of $29.1 million and $1.7 million, respectively, to all of our defined benefit pension plans and other postretirement benefit plans during 2012.

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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-Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS88 -Paragraph 63 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 8 -Subparagraph m -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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