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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense   $ 103.0 $ 102.9
Share awards outstanding, remaining contractual life (years)   1.59  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 185.0   144.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   $ 19.93  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 291.2 $ 291.2  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   3 years 0 months 4 days  
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proportional vesting rate   0.00%  
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proportional vesting rate   100.00%