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Share-Based Compensation Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
plans
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Long Term Incentive Plan 2001 [Member]
Dec. 31, 2012
Performance Incentive Plan 2010 [Member]
Feb. 07, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Minimum [Member]
Dec. 31, 2012
Restricted Stock [Member]
Maximum [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2012
Stock Option [Member]
Minimum [Member]
Dec. 31, 2012
Stock Option [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number Of Share Based Compensation Plans 2                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       3,250,000 2,450,000            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           3 years 3 years 6 years   3 years 6 years
Contractual term (in years)                 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 0 0                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 11.77                
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options $ 5.7 $ 15.2 $ 4.2                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 4.2 5.6 4.2                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 96.35 $ 81.94 $ 73.51                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 10.3 6.3 4.3                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 15.3                    
Period for recognition (in years) 4 years 7 months 6 days                    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 4 months