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, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 193.4 $ 188.1 $ 169.8
Pension Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 700.6 749.8 712.5
Defined Benefit Plan, Benefit Obligation (910.8) (998.0) (891.2)
Defined Benefit Plan, Funded Status of Plan (210.2) (248.2)  
Additional shutdown and early retirement benefits (23.2)    
Other Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 250.6 269.3 251.8
Defined Benefit Plan, Benefit Obligation (266.0) (295.8) $ (265.1)
Defined Benefit Plan, Funded Status of Plan (15.4) $ (26.5)  
Additional shutdown and early retirement benefits $ (3.2)