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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables) | 9 Months Ended
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Sep. 30, 2016
Postemployment Benefits [Abstract] |
Schedule of Net Benefit Costs | The following are the components of defined benefit pension and OPEB expense for the three and nine months ended September 30, 2016 and 2015: Defined Benefit Pension Expense
| (In Millions)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 4.2 |  |  | $ | 3.1 |  |  | $ | 13.2 |  |  | $ | 15.7 |
Interest cost | 7.8 |  |  | 9.0 |  |  | 22.7 |  |  | 27.9 |
Expected return on plan assets | (13.6 | ) |  | (14.5 | ) |  | (41.0 | ) |  | (44.4 | )
Amortization: |  |  |  |  |  |  |
Prior service costs | 0.5 |  |  | 0.5 |  |  | 1.6 |  |  | 1.7 |
Net actuarial loss | 5.4 |  |  | 4.5 |  |  | 15.9 |  |  | 15.3 |
Curtailments/settlements | — |  |  | $ | (0.1 | ) |  | — |  |  | 0.2 |
Net periodic benefit cost to continuing operations | $ | 4.3 |  |  | $ | 2.5 |  |  | $ | 12.4 |  |  | $ | 16.4 |
Other Postretirement Benefits Expense
| (In Millions)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 0.4 |  |  | $ | (1.6 | ) |  | $ | 1.3 |  |  | $ | 1.4 |
Interest cost | 2.3 |  |  | 2.1 |  |  | 6.8 |  |  | 8.6 |
Expected return on plan assets | (4.3 | ) |  | (4.5 | ) |  | (12.8 | ) |  | (13.7 | )
Amortization: |  |  |  |  |  |  |
Prior service credits | (0.9 | ) |  | 0.6 |  |  | (2.8 | ) |  | (1.2 | )
Net actuarial loss | 1.7 |  |  | 1.1 |  |  | 4.5 |  |  | 4.2 |
Net periodic benefit credit to continuing operations | $ | (0.8 | ) |  | $ | (2.3 | ) |  | $ | (3.0 | ) |  | $ | (0.7 | )

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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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