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Pension Plans and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2013
Pension And Other Postretirement Benefits Disclosure [Abstract] |
Pension Plans and Other Postretirement Benefits | Note 7. Pension Plans and Other Postretirement Benefits The Company has defined benefit pension plans and defined contribution plans covering substantially all employees. Benefits under the defined benefit pension plans are generally based on years of service and/or final average pay. The Company funds the U.S. pension plans in accordance with the Employee Retirement Income Security Act of 1974, as amended, and the Internal Revenue Code. The Company also sponsors several postretirement plans covering certain salaried and hourly employees. The plans provide health care and life insurance benefits for eligible retirees. In most plans, Company contributions towards premiums are capped based on the cost as of a certain date, thereby creating a defined contribution. For the non-collectively bargained plans, the Company maintains the right to amend or terminate the plans at its discretion. For the three month periods ended June 30, 2013 and 2012, th e components of pension expense and components of other postretirement benefit expense for the Company's defined benefit plans included the following (in millions):
| Pension Benefits |  | Other Postretirement Benefits
| Three Months Ended |  | Three Months Ended
| June 30, |  | June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Service cost - benefits earned during the year | $ | 10.0 |  | $ | 8.7 |  | $ | 0.8 |  | $ | 0.8
Interest cost on benefits earned in prior years |  | 30.3 |  |  | 33.1 |  |  | 5.6 |  |  | 6.5
Expected return on plan assets |  | (43.8) |  |  | (45.3) |  |  | (0.1) |  |  | (0.2)
Amortization of prior service cost (credit) |  | 0.7 |  |  | 1.6 |  |  | (4.5) |  |  | (4.6)
Amortization of net actuarial loss |  | 29.2 |  |  | 26.3 |  |  | 4.3 |  |  | 3.7
Total retirement benefit expense | $ | 26.4 |  | $ | 24.4 |  | $ | 6.1 |  | $ | 6.2
For the six month periods ended June 30, 2013 and 2012, the components of pension expense and components of other postretirement benefit expense for the Company's defined benefit plans included the following (in millions):
| Pension Benefits |  | Other Postretirement Benefits
| Six Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Service cost - benefits earned during the year | $ | 20.0 |  | $ | 17.5 |  | $ | 1.6 |  | $ | 1.6
Interest cost on benefits earned in prior years |  | 60.6 |  |  | 66.2 |  |  | 11.2 |  |  | 13.0
Expected return on plan assets |  | (87.6) |  |  | (90.7) |  |  | (0.2) |  |  | (0.4)
Amortization of prior service cost (credit) |  | 1.5 |  |  | 3.2 |  |  | (9.1) |  |  | (9.1)
Amortization of net actuarial loss |  | 58.4 |  |  | 52.6 |  |  | 8.6 |  |  | 7.3
Total retirement benefit expense | $ | 52.9 |  | $ | 48.8 |  | $ | 12.1 |  | $ | 12.4

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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 Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-2 -Paragraph 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. 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Reference 7: 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 8: 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. 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Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 30 -Paragraph 26 -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 14: 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. + Details
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