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Stock-Based Incentive Plan (Narrative) (Details) (Long Term Incentive Plan 2003, USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock Shares Reserved for Issuance through Incentive Awards 55,300,000  
Stock Option Award Expiration Period 10 years  
Maximum Shares That May Be Issued as Restricted Shares, Restricted Units, Performance Shares and Stock Awards 8,000,000  
Options, Outstanding, Weighted Average Remaining Contractual Term (Years) 5 years 11 months 19 days  
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term (Years) 5 years 10 months 5 days  
Options, Exercisable, Weighted Average Remaining Contractual Term (Years) 4 years 8 months 17 days  
Options, Outstanding, Aggregate Intrinsic Value $ 133.1  
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 130.1  
Options, Exercisable, Aggregate Intrinsic Value 114.4  
Total Compensation Cost Not yet Recognized, Net of Estimated Forfeitures 53.0  
Weighted-Average Period over which Total Unrecognized Compensation Cost is Expected to be Recognized (Years) 1 year 7 months 25 days  
Stock-Based Awards Exercised and Restricted Stock Units Converted, Intrinsic Value $ 45.8 $ 61.2
Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Option Award Vesting Period 3 years  
Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Option Award Vesting Period 4 years