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Common Stock and Earnings Per Share - Summary of Common Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Class of Stock [Line Items]        
Common Stock Outstanding, Shares 37,500,000 35,800,000    
Purchase of Non-Controlling Interest, Shares 200,000      
Contributions to Pension, Shares 507,600      
Contributions to Pension, Value $ 20.0      
Common Stock [Member]
        
Class of Stock [Line Items]        
Common Stock Outstanding, Shares 37,513,000 35,817,000 35,221,000 32,585,000
Common Stock Outstanding, Value 705.6 636.1 613.4 534.1
Employee Stock Purchase Program, Shares 20,000 19,000 24,000  
Employee Stock Purchase Program, Value 0.8 0.6 0.7  
Invest Direct, Shares 437,000 346,000 456,000  
Invest Direct, Value 17.2 11.7 13.6  
Options and Stock Awards, Shares 109,000 51,000 8,000  
Options and Stock Awards, Value 6.7 4.4 1.1  
Equity Issuance Program, Shares 400,000 180,000 1,685,000  
Equity Issuance Program, Value 16.0 6.0 51.9  
Purchase of Non-Controlling Interest, Shares 222,000      
Purchase of Non-Controlling Interest, Value 8.8      
Contributions to Pension, Shares 507,600   463,000  
Contributions to Pension, Value $ 20.0   $ 12.0  
Equity Issuance Program Shares Authorized 6,600,000      
Equity Issuance Program Shares Available for Issuance 2,700,000