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, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 202.4 $ 193.4 $ 188.1
Pension Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 685.8 700.6 749.8
Defined Benefit Plan, Benefit Obligation (931.6) (910.8) (998.0)
Defined Benefit Plan, Funded Status of Plan (245.8) (210.2)  
Additional shutdown and early retirement benefits 22.1    
Other Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 253.0 250.6 269.3
Defined Benefit Plan, Benefit Obligation (264.6) (266.0) $ (295.8)
Defined Benefit Plan, Funded Status of Plan (11.6) $ (15.4)  
Additional shutdown and early retirement benefits $ 2.2