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EMPLOYEE BENEFIT PLANS - Deferred Comp Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred salary agreements    
Deferred Compensation Plans    
Recorded liabilities $ 1.8 $ 2.1
Voluntary Savings Plan - mutual funds held in trust    
Deferred Compensation Plans    
Minimum period for election to defer receipt of a portion of salary and incentive compensation 6 months  
Voluntary Savings Plan - mutual funds held in trust | Other long-term assets    
Deferred Compensation Plans    
VSP assets $ 3.0 2.4
Voluntary Savings Plan - mutual funds held in trust | Other long-term liabilities    
Deferred Compensation Plans    
VSP liabilities $ 3.0 $ 2.4