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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2016
Defined Benefit Pension Plans |
Components of Net Periodic Defined Benefit Cost | Defined benefit plans – The components of our net periodic defined benefit pension cost are presented in the table below.
| Three months ended June 30, |  |  | Six months ended June 30, |
| 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |
| (In millions) |
Service cost | $ | 2.7 |  |  | $ | 2.5 |  |  | $ | 5.6 |  |  | $ | 5.0 |
Interest cost |  | 4.4 |  |  |  | 4.5 |  |  |  | 9.0 |  |  |  | 8.9 |
Expected return on plan assets |  | (5.3 | ) |  |  | (4.7 | ) |  |  | (10.7 | ) |  |  | (9.2 | )
Amortization if unrecognized prior service cost |  | .2 |  |  |  | .2 |  |  |  | .4 |  |  |  | .4 |
Recognized actuarial losses |  | 3.8 |  |  |  | 3.4 |  |  |  | 7.6 |  |  |  | 6.6 |
Total | $ | 5.8 |  |  | $ | 5.9 |  |  | $ | 11.9 |  |  | $ | 11.7 |
OPEB |
Components of Net Periodic Defined Benefit Cost | Other postretirement benefits – The components of our net periodic other postretirement benefit cost are presented in the table below.
| Three months ended June 30, |  |  | Six months ended June 30, |
| 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |
| (In millions) |
Service cost | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |
Interest cost |  | — |  |  |  | — |  |  |  | .2 |  |  |  | .2 |
Amortization of prior service credit |  | (.4 | ) |  |  | (.4 | ) |  |  | (.9 | ) |  |  | (.9 | )
Recognized actuarial gains |  | (.1 | ) |  |  | — |  |  |  | (.1 | ) |  |  | (.1 | )
Total | $ | (.4 | ) |  | $ | (.3 | ) |  | $ | (.7 | ) |  | $ | (.7 | )

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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
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