Annual report pursuant to Section 13 and 15(d)

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

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Other Potential Benefit Obligations) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 229.1 $ 215.6 $ 202.4
Pension Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 687.2 749.8 685.8
Defined Benefit Plan, Benefit Obligation (905.7) (973.1) (931.6)
Defined Benefit Plan, Funded (Unfunded) Status of Plan (218.5) (223.3)  
Other Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 240.2 262.5 253.0
Defined Benefit Plan, Benefit Obligation (241.9) (265.9) $ (264.6)
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (1.7) $ (3.4)