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Capital Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Common stock, authorized (in shares) 500,000,000 500,000,000  
Common stock, par value (in dollars per share) $ 0.001 $ 0.001  
Weighted average share outstanding [Abstract]      
Basic weighted-average common shares outstanding (in shares) 58,606,000 60,600,000 62,066,000
Effect of dilutive securities: Stock awards and options (in shares) 2,842,000 2,425,000 2,480,000
Diluted weighted-average common shares outstanding (in shares) 61,448,000 63,025,000 64,546,000
Securities excluded from the calculation of diluted earnings per share 1,200,000 100,000 0
Equity, Class of Treasury Stock [Line Items]      
Class A common stock repurchased (in shares) 1,700,000 4,600,000 1,900,000
Aggregate price of repurchased stock $ 140.9 $ 201.5 $ 67.1
Increment authorized by the Company's board of directors under the stock repurchase program 400.0 250.0  
Amount available for repurchases $ 394.5    
Preferred Stock [Member]
      
Preferred stock, authorized (in shares) 25,000,000    
Preferred stock, par value (in dollars per share) $ 0.001    
Shares outstanding (in shares) 0    
Common Class A [Member]
      
Common stock, authorized (in shares) 500,000,000    
Common stock, par value (in dollars per share) $ 0.001    
Number of votes class is entitled to 1    
Number of shares of class A common stock issued after conversion of Class B common stock   1  
Common Class B [Member]
      
Common stock, authorized (in shares) 100,000,000    
Common stock, par value (in dollars per share) $ 0.001    
Shares outstanding (in shares) 0    
Number of votes class is entitled to 10