Annual report pursuant to Section 13 and 15(d)

Pensions And Other Postretirement Benefits (Fair Values Other Benefit Plan Assets) (Details)

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Pensions And Other Postretirement Benefits (Fair Values Other Benefit Plan Assets) (Details) (Other Benefits [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]      
Assets $ 193.5 $ 174.2 $ 136.7
Equity Securities [Member] | US Large Cap [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 46.5 38.5  
Equity Securities [Member] | US Small Mid Cap [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 7.9 11.7  
Equity Securities [Member] | International [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 26.8 27.2  
Fixed Income Investments [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 64.9 65.2  
Hedge Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 28.3 24.0  
Private Equity Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 8.7 7.4  
Real Estate [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 10.2    
Cash [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 0.2 0.2  
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 148.2 145.3  
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member] | Equity Securities [Member] | US Large Cap [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 46.5 38.5  
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member] | Equity Securities [Member] | US Small Mid Cap [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 7.9 11.7  
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member] | Equity Securities [Member] | International [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 26.8 27.2  
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member] | Fixed Income Investments [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 64.9 65.2  
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member] | Private Equity Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 1.9 2.5  
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member] | Cash [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 0.2 0.2  
Significant Unobservable Inputs (Level 3) [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 45.3 28.9  
Significant Unobservable Inputs (Level 3) [Member] | Hedge Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 28.3 24.0  
Significant Unobservable Inputs (Level 3) [Member] | Private Equity Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets 6.8 4.9  
Significant Unobservable Inputs (Level 3) [Member] | Real Estate [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Assets $ 10.2