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EMPLOYEE BENEFIT PLANS - Defined Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Expected employer contributions $ 1.9  
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation 93.5 $ 105.6
Net actuarial loss that will be amortized 0.9  
Prior service cost that will be amortized $ (0.2)