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Incentive Stock Plans Share-based Compensation Arrangement by Share-based Payment Award, Options (Details) (Stock Options [Member], USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Expense Recognition Period straight-line basis over three years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period ratably over three years    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2.0    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1.0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Period Start 2,633,158    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Period End 2,346,451 2,633,158  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period (10,914)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 1,711,739    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 27.47    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 25.80    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5.7    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 32.2    
Shared-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Total Fair Value 2.5 2.4 2.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 10.4 [1] 15.6 [1] 12.0 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 26.77 $ 24.90  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6.3    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 41.9    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 2,344,871    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 26.77    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 6.3    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 41.9    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 296,490    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 37.05    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (572,283)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 23.61    
[1] Intrinsic value of options exercised is the amount by which the fair value of the stock on the exercise date exceeded the exercise price of the option.