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EMPLOYEE BENEFITS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Components of net periodic benefit cost |  |  |  |
Contributions and payments related to pension and OPEB plans |  |  | $ 115.4 | $ 23.5
Pension Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | $ 11.1 | $ 10.9 | 33.2 | 32.9
Interest cost | 30.3 | 33.2 | 91.7 | 99.4
Expected return on plan assets | (48.8) | (49.0) | (146.9) | (147.0)
Loss on plan settlement | 2.9 | 0.7 | 8.2 | 14.8
Amortization of prior service cost (credit) | 0.7 | 0.9 | 2.2 | 2.6
Amortization of net actuarial loss | 21.5 | 20.4 | 64.5 | 61.1
Net periodic benefit (credit) cost | 17.7 | 17.1 | 52.9 | 63.8
Contributions and payments related to pension and OPEB plans |  |  | 109.8 |
Estimated future employer contributions for the remainder of the year | 3.8 |  | 3.8 |
Other Postretirement Benefit Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | 6.0 | 6.5 | 17.9 | 19.6
Interest cost | 8.4 | 9.2 | 25.3 | 27.7
Expected return on plan assets | (13.6) | (13.2) | (40.9) | (39.6)
Amortization of prior service cost (credit) | (2.8) | (2.3) | (8.4) | (7.0)
Amortization of net actuarial loss | 0.7 | 2.2 | 2.3 | 6.4
Net periodic benefit (credit) cost | (1.3) | $ 2.4 | (3.8) | $ 7.1
Contributions and payments related to pension and OPEB plans |  |  | 5.6 |
Estimated future employer contributions for the remainder of the year | $ 3.9 |  | $ 3.9 |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details
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