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Stock-Based Incentive Plan (Narrative) (Details) (Long Term Incentive Plan 2003, USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock shares reserved for issuance to employees 55,300,000  
Total unrecognized compensation expense, net of estimated forfeitures $ 84.0  
Weighted-average period over which total unrecognized compensation expense expected to be recognized, in years 1 year 9 months 20 days  
Intrinsic value of stock-based awards exercised and restricted stock units converted 51.6 34.9
Stock Options
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option award expiration period, in years 10 years  
Average remaining contractual term for options outstanding, in years 6 years 8 months 5 days  
Average remaining contractual term for options vested and expected to vest, in years 6 years 6 months 30 days  
Average remaining contractual term for options exercisable, in years 5 years 6 months 8 days  
Aggregate intrinsic value for options outstanding 157.2  
Aggregate intrinsic value for options vested and expected to vest 150.6  
Aggregate intrinsic value for options exercisable $ 116.6  
Stock Options | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option award vesting period, in years 3 years  
Stock Options | Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option award vesting period, in years 4 years