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EMPLOYEE BENEFITS-COSTS AND CONTRIBUTIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Components of net periodic benefit cost |  |  |  |
Contributions and payments related to pension and OPEB plans |  |  | $ 13.8 | $ 115.4
Pension Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | $ 11.9 | $ 11.1 | 35.7 | 33.2
Interest cost | 28.5 | 30.3 | 85.5 | 91.7
Expected return on plan assets | (49.2) | (48.8) | (147.6) | (146.9)
Loss on plan settlement | 0.4 | 2.9 | 1.1 | 8.2
Amortization of prior service (credit) cost | 0.7 | 0.7 | 2.0 | 2.2
Amortization of net actuarial loss | 23.6 | 21.5 | 70.6 | 64.5
Net periodic benefit (credit) cost | 15.9 | 17.7 | 47.3 | 52.9
Contributions and payments related to pension and OPEB plans |  |  | 9.8 |
Estimated future employer contributions for the remainder of the year | 2.8 |  | 2.8 |
Other Postretirement Benefit Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | 5.9 | 6.0 | 17.7 | 17.9
Interest cost | 7.5 | 8.4 | 22.4 | 25.3
Expected return on plan assets | (14.9) | (13.6) | (44.6) | (40.9)
Amortization of prior service (credit) cost | (3.8) | (2.8) | (11.5) | (8.4)
Amortization of net actuarial loss | 0.3 | 0.7 | 0.8 | 2.3
Net periodic benefit (credit) cost | (5.0) | $ (1.3) | (15.2) | $ (3.8)
Contributions and payments related to pension and OPEB plans |  |  | 4.0 |
Estimated future employer contributions for the remainder of the year | $ 4.1 |  | $ 4.1 |

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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