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Common Stock and Earnings Per Share - Summary of Common Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Dec. 31, 2009
Common Stock [Member]
Class of Stock [Line Items]                
Common Stock Outstanding, Shares   39,400,000 37,500,000   39,377,000 37,513,000 35,817,000 35,221,000
Common Stock Outstanding, Value         $ 784.7 $ 705.6 $ 636.1 $ 613.4
Employee Stock Purchase Program, Shares         20,000 20,000 19,000  
Employee Stock Purchase Program, Value         0.8 0.8 0.6  
Invest Direct, Shares         474,000 437,000 346,000  
Invest Direct, Value         19.2 17.2 11.7  
Options and Stock Awards, Shares         95,000 109,000 51,000  
Options and Stock Awards, Value         6.0 6.7 4.4  
Equity Issuance Program, Shares         1,275,000 400,000 180,000  
Equity Issuance Program, Value         53.1 16.0 6.0  
Purchase of Non-Controlling Interest, Shares 200,000         222,000    
Purchase of Non-Controlling Interest, Value           8.8    
Contributions to Pension, Shares           508,000    
Contributions to Pension, Value   $ 0 $ (20.0) $ 0   $ 20.0    
Antidilutive Options to Purchase Shares of Common Stock Excluded from the Computation of Earnings Per Share         200,000 300,000 500,000  
Equity Issuance Program Shares Authorized         9,600,000      
Equity Issuance Program Shares Available for Issuance         4,500,000