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, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 200.5 $ 192.2 $ 186.0
Pension Benefits [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 838.7 744.1 734.3
Benefit obligation 1,244.3 1,141.4 1,022.3
Underfunded status of plan (405.6) (397.3)  
Additional shutdown and early retirement benefits 32.5    
Other Benefits [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 237.0 193.5 174.2
Benefit obligation 459.8 488.4 440.2
Underfunded status of plan (222.8) (294.9)  
Additional shutdown and early retirement benefits $ 31.5