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Capital Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2012
May 31, 2012
May 30, 2012
Dec. 31, 2011
Incentive Plans        
Common stock, Authorized shares 480,000,000 480,000,000 240,000,000 240,000,000
Treasury stock        
Cumulative number of shares repurchased under a share repurchase program 10,409,400      
Treasury stock, number of shares authorized to be repurchased 20,000,000      
Cumulative cost of shares repurchased under a share repurchase program $ 85.7      
Treasury stock, cumulative shares retired 10,005,000      
Shares held as treasury stock 404,400     404,400
2004 Incentive Plan
        
Incentive Plans        
Number of shares reserved for issuance 10,200,000      
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 3,600,000      
2004 Incentive Plan | Stock options | Less than or equal to
        
Incentive Plans        
Number of shares reserved for issuance 6,000,000