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Pension, Postretirement, Other Postemployment, and Employee Savings Plan Benefits (Details 5) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Plan
      
Disclosures by plan assets      
Total Fair Value $ 1,487.7 $ 1,408.1 $ 1,058.1
Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 1,487.7    
Level 1 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 226.1 277.8  
Level 2 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 1,098.9 1,012.0  
Level 3 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 162.7 118.3 74.4
Global equity securities: Money market funds | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 22.6 26.1  
Global equity securities: Money market funds | Level 1 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 22.6 26.1  
Marketable equity securities | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 125.5 143.6  
Marketable equity securities | Level 1 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 125.5 143.6  
Common collective trusts | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 420.4 421.4  
Common collective trusts | Level 2 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 420.4 421.4  
Global equity securities: Mutual funds | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 2.2    
Global equity securities: Mutual funds | Level 1 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 2.2    
Fixed income securities: Money market funds | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 20.4 9.8  
Fixed income securities: Money market funds | Level 1 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 20.4 9.8  
Corporate debt | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 327.3 318.0  
Corporate debt | Level 2 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 327.3 318.0  
Government / agency securities | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 178.2 112.7  
Government / agency securities | Level 2 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 178.2 112.7  
Municipal Bonds | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 73.3 54.8  
Municipal Bonds | Level 2 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 73.3 54.8  
Guarantee insurance contracts | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 20.6 21.6  
Guarantee insurance contracts | Level 2 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 20.6 21.6  
Asset and mortgage-backed securities Mutual funds | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 1.8 0.4  
Asset and mortgage-backed securities Mutual funds | Level 2 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 1.8 0.4  
Fixed income securities: mutual funds | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 1.0    
Fixed income securities: mutual funds | Level 1 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 1.0    
High yield bonds: money market funds | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 5.4 4.7  
High yield bonds: money market funds | Level 1 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 5.4 4.7  
High yield bonds: corporate debt securities | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 76.9 82.2  
High yield bonds: corporate debt securities | Level 2 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 76.9 82.2  
Cash and cash equivalents | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 49.0 93.6  
Cash and cash equivalents | Level 1 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 49.0 93.6  
Derivative instruments. | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 0.4 0.9  
Derivative instruments. | Level 2 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 0.4 0.9  
Alternative investments | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value 162.7 118.3 74.4
Alternative investments | Level 3 | Qualified Pension Plans
      
Disclosures by plan assets      
Total Fair Value $ 162.7 $ 118.3