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Stockholders' Equity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stockholders' equity      
Common stock, shares authorized 153.0 153.0  
Share repurchase activity      
Shares Repurchase (in shares) 0.1 0.6 0.7
Preferred Stock [Member]
      
Stockholders' equity      
Preferred stock, shares authorized 5.0    
Common Stock [Member]
      
Stockholders' equity      
Maximum number of shares yet to be repurchased 2.2    
Share repurchase activity      
Shares Repurchase (in shares) 0.1 0.6 0.7
Average Price (in dollars per share) $ 184.89 $ 107.44 $ 83.63
Voting Common Stock [Member]
      
Stockholders' equity      
Common stock, shares authorized 150.0    
Class B Non-Voting Common Stock [Member]
      
Stockholders' equity      
Common stock, shares authorized 3.0