Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Effect of One-Percentage Point Change in Assumed Healthcare Cost Trend Rates) (Details)

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BENEFIT PLANS (Effect of One-Percentage Point Change in Assumed Healthcare Cost Trend Rates) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Retirement Benefits [Abstract]  
Effect of 1-percentage point increase on total service and interest cost components $ 0.1
Effect of 1-percentage point increase on accumulated postretirement benefit obligation 1.5
Effect of 1-percentage point decrease on total service and interest cost components (0.1)
Effect of 1-percentage point decrease on accumulated postretirement benefit obligation $ (1.4)