Annual report pursuant to Section 13 and 15(d)

Pensions And Other Postretirement Benefits (Estimated Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Into Net Periodic Benefit Cost-2012) (Details)

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Pensions And Other Postretirement Benefits (Estimated Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Into Net Periodic Benefit Cost-2012) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss $ 19.6 $ 23.1 $ 26.8
Prior service cost (4.4) (4.4) (4.2)
Other Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss 8.8 8.9 11.5
Prior service cost (3.7) (1.7) (1.8)
Transition asset (3.0) (3.0) (3.0)
Scenario, Estimated [Member] | Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss 29.5    
Prior service cost 3.9    
Net amount recognized 33.4    
Scenario, Estimated [Member] | Other Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss 11.4    
Prior service cost 3.0    
Transition asset (3.0)    
Net amount recognized $ 11.4