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PENSIONS AND OTHER POSTRETIREMENT BENEFITS | 6 Months Ended
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Jun. 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 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 | )
We made pension contributions of $2.3 million for the three and six months ended June 30, 2017. We made no contributions for the three months ended June 30, 2016 and $0.3 million for the six months ended June 30, 2016. 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 six months ended June 30, 2017 and June 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 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + Details
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