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Capital Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]      
Common stock, shares authorized 750,000,000 750,000,000  
Common Stock, par value $ 0.01 $ 0.01  
Percentage of increase in quarterly cash dividend 14.00%    
Dividend declared, per share $ 0.16    
Preferred stock, shares authorized 60,000,000    
Preferred stock, par value $ 0.01    
Common stock repurchases 1,091,067 11,116,772  
Treasury stock purchases $ 51.7 $ 439.8 $ 52.1
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 247.8