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BENEFIT PLANS - EFFECT OF ONE PERCENTAGE POINT IN ASSUMED HEALTHCARE TREND RATES (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Compensation and Retirement Disclosure [Abstract]  
Effect of one percent increase on total of service and interest cost components $ 0.1
Effect of one percent increase on postretirement benefit obligation 2.1
Effect of one percent decrease on total of service and interest cost components (0.1)
Effect of one percent decrease on postretirement benefit obligation $ (2.7)