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Capital Stock (Details) (USD $)
 0 Months Ended 12 Months Ended
Jul. 23, 2013
Jul. 23, 2012
Dec. 31, 2013
Dec. 31, 2012
May 31, 2012
May 30, 2012
Incentive Plans            
Treasury stock, number of shares authorized to be repurchased     40,000,000      
Stock split            
Stock split ratio declared by the Board of Directors 2 2        
Common stock, Authorized shares     480,000,000 480,000,000 480,000,000 240,000,000
Treasury stock            
Number of shares repurchased     4,800,000      
Cost of shares repurchased     $ 164,634,000      
Cumulative number of shares repurchased under a share repurchase program     25,600,000      
Cumulative cost of shares repurchased under a share repurchase program     $ 249,700,000      
Treasury stock, cumulative shares retired     20,000,000      
Treasury stock reissued     0      
Shares held as treasury stock     5,618,166 808,800    
2004 Incentive Plan
            
Incentive Plans            
Number of shares reserved for issuance     20,400,000      
Treasury stock, number of shares authorized to be repurchased     1,700,000      
2004 Incentive Plan | Stock awards not subject to the achievement of performance based goals | Less than or equal to
            
Incentive Plans            
Number of shares reserved for issuance     7,200,000      
2004 Incentive Plan | Stock options | Less than or equal to
            
Incentive Plans            
Number of shares reserved for issuance     12,000,000