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Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Change of One Percentage Point in Assumed Health Care Cost Trend Rates) (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Change of One Percentage Point in Assumed Health Care Cost Trend Rates) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý
Effect on total of service and interest cost due to one percentage point increase $ 1.0
Effect on total of service and interest cost due to one percentage point decrease (0.8)
Effect on postretirement benefit obligation due to one percentage point increase 21.2
Effect on postretirement benefit obligation due to one percentage point decrease $ (17.6)