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Employee Stock and Incentive Plans - Non-Qualified Stock Options (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2008
Number of Options [Abstract]        
Outstanding as of January 1, 395,678 460,234 560,887  
Granted 0 [1] 0 [1] 0 [1]  
Exercised 287,379 49,075 80,798  
Forfeited 0 15,481 19,855  
Outstanding as of December 31, 108,299 395,678 460,234  
Exercisable as of December 31, 108,299 395,678 460,234  
Weighted Average Exercise Price [Abstract]        
Outstanding as of January 1, $ 42.28 $ 41.68 $ 40.69  
Granted $ 0.00 [1] $ 0.00 [1] $ 0.00 [1]  
Exercised $ 41.60 $ 35.84 $ 34.25  
Forfeited $ 0.00 $ 44.86 $ 43.96  
Outstanding as of December 31, $ 44.10 $ 42.28 $ 41.68  
Exercisable as of December 31, $ 43.17 $ 41.71 $ 41.59  
Proceeds from Stock Options Exercised $ 11.4      
Weighted Average Grant Date Intrinsic Value of Options Granted       $ 6.18
Total Intrinsic Value of Options Exercised $ 2.2 $ 0.3 $ 0.5  
[1] Stock options have not been granted since 2008. The weighted-average grant-date intrinsic value of options granted in 2008 was $6.18.