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Pension Plans and Other Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule Of Defined Benefit Plans Disclosures | For the three month periods ended September 30, 2015 and 2014, 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
| Three months ended September 30, |  | Three months ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Service cost - benefits earned during the year | $ | 5.7 |  |  | $ | 7.3 |  |  | $ | 0.7 |  |  | $ | 0.7 |
Interest cost on benefits earned in prior years | 30.3 |  |  | 33.4 |  |  | 4.4 |  |  | 6.0 |
Expected return on plan assets | (42.1 | ) |  | (46.1 | ) |  | — |  |  | (0.1 | )
Amortization of prior service cost (credit) | 0.3 |  |  | 0.6 |  |  | 1.2 |  |  | (0.8 | )
Amortization of net actuarial loss | 15.1 |  |  | 18.5 |  |  | 3.7 |  |  | 3.6 |
Total retirement benefit expense | $ | 9.3 |  |  | $ | 13.7 |  |  | $ | 10.0 |  |  | $ | 9.4 |
For the nine month periods ended September 30, 2015 and 2014, 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
| Nine months ended September 30, |  | Nine months ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Service cost - benefits earned during the year | $ | 17.1 |  |  | $ | 22.0 |  |  | $ | 2.1 |  |  | $ | 2.1 |
Interest cost on benefits earned in prior years | 90.8 |  |  | 100.2 |  |  | 13.4 |  |  | 18.0 |
Expected return on plan assets | (126.2 | ) |  | (138.2 | ) |  | — |  |  | (0.2 | )
Amortization of prior service cost (credit) | 0.9 |  |  | 1.8 |  |  | 3.6 |  |  | (2.3 | )
Amortization of net actuarial loss | 45.3 |  |  | 55.5 |  |  | 10.9 |  |  | 10.6 |
Termination benefits | — |  |  | 0.3 |  |  | — |  |  | — |
Total retirement benefit expense | $ | 27.9 |  |  | $ | 41.6 |  |  | $ | 30.0 |  |  | $ | 28.2 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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