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PENSIONS AND OTHER POSTRETIREMENT BENEFITS | 9 Months Ended
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Sep. 30, 2017
Postemployment Benefits [Abstract] |
PENSIONS AND OTHER POSTRETIREMENT BENEFITS | NOTE 7 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS We offer defined benefit pension plans, defined contribution pension plans and OPEB plans, primarily consisting of retiree healthcare benefits, to most employees in the United States as part of a total compensation and benefits program. We do not have employee retirement benefit obligations at our Asia Pacific Iron Ore operations. The defined benefit pension plans largely are noncontributory and benefits generally are based on a minimum formula or employees’ years of service and average earnings for a defined period prior to retirement. The following are the components of defined benefit pension and OPEB costs and credits for the three and nine months ended September 30, 2017 and 2016: Defined Benefit Pension Costs
| (In Millions)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 3.4 |  |  | $ | 4.2 |  |  | $ | 12.9 |  |  | $ | 13.2 |
Interest cost | 7.9 |  |  | 7.8 |  |  | 22.9 |  |  | 22.7 |
Expected return on plan assets | (13.8 | ) |  | (13.6 | ) |  | (40.9 | ) |  | (41.0 | )
Amortization: |  |  |  |  |  |  |
Prior service costs | 0.6 |  |  | 0.5 |  |  | 1.9 |  |  | 1.6 |
Net actuarial loss | 6.1 |  |  | 5.4 |  |  | 16.7 |  |  | 15.9 |
Net periodic benefit cost | $ | 4.2 |  |  | $ | 4.3 |  |  | $ | 13.5 |  |  | $ | 12.4 |
Other Postretirement Benefits Credits
| (In Millions)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 0.3 |  |  | $ | 0.4 |  |  | $ | 1.3 |  |  | $ | 1.3 |
Interest cost | 1.9 |  |  | 2.3 |  |  | 6.2 |  |  | 6.8 |
Expected return on plan assets | (4.4 | ) |  | (4.3 | ) |  | (13.3 | ) |  | (12.8 | )
Amortization: |  |  |  |  |  |  |
Prior service credits | (0.8 | ) |  | (0.9 | ) |  | (2.3 | ) |  | (2.8 | )
Net actuarial loss | 0.9 |  |  | 1.7 |  |  | 3.4 |  |  | 4.5 |
Net periodic benefit credit | $ | (2.1 | ) |  | $ | (0.8 | ) |  | $ | (4.7 | ) |  | $ | (3.0 | )
Based on funding requirements, we made pension contributions of $19.7 million and $22.0 million for the three and nine months ended September 30, 2017, respectively, compared to pension contributions of $0.5 million and $0.7 million for the three and nine months ended September 30, 2016, respectively. OPEB contributions are typically made on an annual basis in the first quarter of each year, but due to plan funding requirements being met, no OPEB contributions were required or made for the three and nine months ended September 30, 2017 and September 30, 2016.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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- References No definition available. + Details
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