Annual report pursuant to Section 13 and 15(d)

Pensions And Other Postretirement Benefits (Amounts Recognized In Accumulated Other Comprehensive Income) (Details)

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Pensions And Other Postretirement Benefits (Amounts Recognized In Accumulated Other Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Pension Benefits [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss $ 409.1 $ 269.3
Prior service cost 18.8 24.2
Net amount recognized 427.9 293.5
Other Benefits [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss 182.9 152.3
Prior service cost 8.1 11.8
Transition asset (3.0) (5.7)
Net amount recognized $ 188.0 $ 158.4