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RETIREMENT PLANS - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
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