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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables) | 6 Months Ended
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Jun. 30, 2017
Postemployment Benefits [Abstract] |
Schedule of Net Benefit Costs | The following are the components of defined benefit pension and OPEB costs and credits for the three and six months ended June 30, 2017 and 2016: Defined Benefit Pension Costs
| (In Millions)
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 4.7 |  |  | $ | 4.5 |  |  | $ | 9.5 |  |  | $ | 9.0 |
Interest cost | 7.5 |  |  | 7.5 |  |  | 15.0 |  |  | 14.9 |
Expected return on plan assets | (13.6 | ) |  | (13.7 | ) |  | (27.1 | ) |  | (27.4 | )
Amortization: |  |  |  |  |  |  |
Prior service costs | 0.7 |  |  | 0.5 |  |  | 1.3 |  |  | 1.1 |
Net actuarial loss | 5.3 |  |  | 5.3 |  |  | 10.6 |  |  | 10.5 |
Net periodic benefit cost | $ | 4.6 |  |  | $ | 4.1 |  |  | $ | 9.3 |  |  | $ | 8.1 |
Other Postretirement Benefits Credit
| (In Millions)
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 0.5 |  |  | $ | 0.4 |  |  | $ | 1.0 |  |  | $ | 0.9 |
Interest cost | 2.2 |  |  | 2.3 |  |  | 4.3 |  |  | 4.5 |
Expected return on plan assets | (4.5 | ) |  | (4.3 | ) |  | (8.9 | ) |  | (8.5 | )
Amortization: |  |  |  |  |  |  |
Prior service credits | (0.8 | ) |  | (0.9 | ) |  | (1.5 | ) |  | (1.8 | )
Net actuarial loss | 1.3 |  |  | 1.4 |  |  | 2.5 |  |  | 2.8 |
Net periodic benefit credit | $ | (1.3 | ) |  | $ | (1.1 | ) |  | $ | (2.6 | ) |  | $ | (2.1 | )

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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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