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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 3 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2014
Common Stock [Member]
Dec. 31, 2013
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Class of Stock [Line Items]                  
Common Stock Outstanding, Shares   41,400,000 39,400,000     41,401,000 39,377,000 37,513,000 35,817,000
Common Stock Outstanding, Value           $ 885.2 $ 784.7 $ 705.6 $ 636.1
Employee Stock Purchase Program, Shares           16,000 20,000 20,000  
Employee Stock Purchase Program, Value           0.7 0.8 0.8  
Invest Direct, Shares           395,000 474,000 437,000  
Invest Direct, Value           18.5 19.2 17.2  
Options and Stock Awards, Shares           301,000 95,000 109,000  
Options and Stock Awards, Value           17.9 6.0 6.7  
Equity Issuance Program, Shares           1,312,000 1,275,000 400,000  
Equity Issuance Program, Value           63.4 53.1 16.0  
Purchase of Non-Controlling Interest, Shares 200,000             222,000  
Purchase of Non-Controlling Interest, Value               8.8  
Contributions to Pension, Shares         400,000 0 0 508,000  
Contributions to Pension, Value   $ 0 $ 0 $ 20.0 $ 19.5     $ 20.0  
Antidilutive Options to Purchase Shares of Common Stock Excluded from the Computation of Earnings Per Share           0 200,000 300,000  
Equity Issuance Program Shares Authorized           9,600,000      
Equity Issuance Program Shares Available for Issuance           3,100,000