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POSTRETIREMENT BENEFITS (Details 6) - Other Postretirement Benefit Plans, Defined Benefit
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
One-Percentage Point Increase  
Effect of one percentage point increase on total of service and interest costs $ 0.5
Effect of one percentage point increase on postretirement benefit obligation 1.7
One-Percentage Point Decrease  
Effect of one percentage point decrease on total of service and interest costs (0.2)
Effect of one percentage point decrease on postretirement benefit obligation $ (1.5)