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Pension and Post-retirement Plans: (Tables) | 6 Months Ended
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Jun. 30, 2013
Pension and Post-retirement Plans: |
Components of Net Periodic Benefit Cost | The components of net periodic benefit cost recorded for the first six months of 2013 and 2012 were as follows (in millions):
|  | Pension Benefits |  | Post-retirement Benefits |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |
Service cost |  | $ | 1.4 |  | $ | 1.3 |  | $ | 0.5 |  | $ | 0.4 |
Interest cost |  | 4.3 |  | 4.5 |  | 1.1 |  | 1.1 |
Expected return on plan assets |  | (5.9 | ) | (5.3 | ) | — |  | — |
Amortization of net loss |  | 3.4 |  | (0.7 | ) | 0.2 |  | — |
Amortization of prior service cost |  | (1.1 | ) | 4.3 |  | — |  | 0.9 |
Net periodic benefit cost |  | $ | 2.1 |  | $ | 4.1 |  | $ | 1.8 |  | $ | 2.4 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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