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EMPLOYEE BENEFITS-COSTS AND CONTRIBUTIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Components of net periodic benefit cost |  |  |  |
Contributions and payments related to pension and OPEB plans |  |  | $ 9.7 | $ 111.5
Pension Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | $ 11.8 | $ 10.4 | 23.8 | 22.1
Interest cost | 28.7 | 30.2 | 57.0 | 61.4
Expected return on plan assets | (48.8) | (48.5) | (98.4) | (98.1)
Loss on plan settlement | 0.3 | 5.3 | 0.7 | 5.3
Amortization of prior service cost (credit) | 0.6 | 0.8 | 1.3 | 1.5
Amortization of net actuarial loss | 23.9 | 21.1 | 47.0 | 43.0
Net periodic benefit (credit) cost | 16.5 | 19.3 | 31.4 | 35.2
Contributions and payments related to pension and OPEB plans |  |  | 7.0 |
Estimated future employer contributions for the remainder of the year | 65.6 |  | 65.6 |
Other Postretirement Benefit Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | 5.6 | 5.6 | 11.8 | 11.9
Interest cost | 7.4 | 8.4 | 14.9 | 16.9
Expected return on plan assets | (14.8) | (13.6) | (29.7) | (27.3)
Amortization of prior service cost (credit) | (3.9) | (2.8) | (7.7) | (5.6)
Amortization of net actuarial loss | 0.2 | 0.1 | 0.5 | 1.6
Net periodic benefit (credit) cost | (5.5) | $ (2.3) | (10.2) | $ (2.5)
Contributions and payments related to pension and OPEB plans |  |  | 2.7 |
Estimated future employer contributions for the remainder of the year | $ 5.4 |  | $ 5.4 |

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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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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + 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)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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