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Defined Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Cost for Pension and Postretirement Benefits | The components of net periodic benefit cost for pension and postretirement benefits for the three months ended March 31, 2015 and 2014 were as follows:
(In millions) |  | Three Months Ended March 31, |
|  | Pension Benefits |  |  | Postretirement Benefits |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Service cost |  | $ | 3.2 |  |  | $ | 2.7 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 8.5 |  |  |  | 8.2 |  |  |  | 0.2 |  |  |  | 0.2 |
Expected return on plan assets |  |  | (10.2 | ) |  |  | (10.6 | ) |  |  | — |  |  |  | — |
Recognition of prior service credits |  |  | — |  |  |  | — |  |  |  | (3.5 | ) |  |  | (10.6 | )
Recognition of actuarial losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.6 |
Net periodic benefit cost |  | $ | 1.5 |  |  | $ | 0.3 |  |  | $ | (3.3 | ) |  | $ | (9.8 | )

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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=35743120&loc=d3e1928-114920 + Details
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