Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Other Potential Benefit Obligations) (Details)

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Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 215.6 $ 202.4 $ 193.4
Pension Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 749.8 685.8 700.6
Defined Benefit Plan, Benefit Obligation (973.1) (931.6) (910.8)
Defined Benefit Plan, Funded (Unfunded) Status of Plan (223.3) (245.8)  
Other Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 262.5 253.0 250.6
Defined Benefit Plan, Benefit Obligation (265.9) (264.6) $ (266.0)
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (3.4) $ (11.6)