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EMPLOYEE BENEFIT PLANS - Weighted-Average Assumptions, Pension Plans (Details) - Pension Plans | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
United States |  |  |
Summary of weighted-average actuarial assumptions used in determining annual pension expense |  |  |
Discount rate (as a percent) | 3.18% | 4.35% | 3.70%
Rate of increase in compensation levels (as a percent) | 3.00% | 3.00% | 3.00%
Expected long-term rate of return on plan assets (as a percent) | 5.05% | 5.40% | 5.40%
Gain and loss amortization period (years) | 21 years | 22 years | 21 years
Foreign Plans |  |  |
Summary of weighted-average actuarial assumptions used in determining annual pension expense |  |  |
Discount rate (as a percent) | 2.28% | 3.04% | 2.70%
Rate of increase in compensation levels (as a percent) | 3.11% | 3.08% | 3.08%
Expected long-term rate of return on plan assets (as a percent) | 4.99% | 5.36% | 5.50%
Gain and loss amortization period (years) | 24 years | 24 years | 26 years

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- Definition Weighted average rate for present value of future retirement benefits cash flows, 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)(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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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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