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EMPLOYEE BENEFIT PLANS - Assumptions Used in Calculations (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |
Assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 2.26% | 3.06% | 4.11%
Assumptions used to determine net periodic benefit cost for years ended December 31: |  |  |
Discount rate | 3.06% | 4.11% | 3.48%
Expected long-term return on plan assets | 5.72% | 5.72% | 7.17%
Postretirement |  |  |
Assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 2.42% | 3.16% | 4.18%
Assumptions used to determine net periodic benefit cost for years ended December 31: |  |  |
Discount rate | 3.16% | 4.18% | 3.56%
Expected long-term return on plan assets | 0.00% | 0.00% | 0.00%

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- Definition Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate, Post Spinoff + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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