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RETIREMENT PLANS - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Plan Disclosure [Line Items] |  |
Retirement benefit obligations discount rate | 2.02% | 2.88%
Expected actuarial losses included in accumulated other comprehensive loss in net periodic benefit cost in 2020 | $ 0.2 |
Former Executives |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement benefit obligations | $ 8.0 | $ 7.3

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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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