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Defined Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2016
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 six and three months ended June 30, 2016 and 2015 were as follows:
(In millions) |  | Six Months Ended June 30, |
|  | Pension Benefits |  |  | Postretirement Benefits |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Service cost |  | $ | 5.6 |  |  | $ | 6.4 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 17.4 |  |  |  | 16.9 |  |  |  | 0.3 |  |  |  | 0.3 |
Expected return on plan assets |  |  | (19.0 | ) |  |  | (20.4 | ) |  |  | — |  |  |  | — |
Recognition of prior service credits |  |  | — |  |  |  | — |  |  |  | (6.2 | ) |  |  | (7.0 | )
Recognition of actuarial losses |  |  | — |  |  |  | — |  |  |  | 0.9 |  |  |  | — |
Net periodic benefit cost (income) |  | $ | 4.0 |  |  | $ | 2.9 |  |  | $ | (5.0 | ) |  | $ | (6.7 | )
(In millions) |  | Three Months Ended June 30, |
|  | Pension Benefits |  |  | Postretirement Benefits |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Service cost |  | $ | 2.8 |  |  | $ | 3.2 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 8.7 |  |  |  | 8.4 |  |  |  | 0.2 |  |  |  | 0.1 |
Expected return on plan assets |  |  | (9.5 | ) |  |  | (10.2 | ) |  |  | — |  |  |  | — |
Recognition of prior service credits |  |  | — |  |  |  | — |  |  |  | (3.9 | ) |  |  | (3.5 | )
Net periodic benefit cost (income) |  | $ | 2.0 |  |  | $ | 1.4 |  |  | $ | (3.7 | ) |  | $ | (3.4 | )

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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=65897934&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration