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Stock-Based Incentive Plan (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized compensation expense, net of estimated forfeitures $ 94.1  
Weighted-average period over which total unrecognized compensation expense expected to be recognized (years) 1 year 11 months 25 days  
Intrinsic value of stock-based awards exercised and restricted stock units converted 41.5 28.1
Long Term Incentive Plan 2003
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock shares reserved for issuance to employees 55,300,000  
Average remaining contractual term for options outstanding (years) 6 years 9 months 25 days  
Average remaining contractual term for options vested and expected to vest (years) 6 years 8 months 22 days  
Average remaining contractual term for options exercisable (years) 5 years 8 months 0 days  
Aggregate intrinsic value for options outstanding 137.3  
Aggregate intrinsic value for options vested and expected to vest 131.7  
Aggregate intrinsic value for options exercisable $ 102.1  
Long Term Incentive Plan 2003 | Stock Options
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option award expiration period 10 years  
Long Term Incentive Plan 2003 | Stock Options | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option award vesting period 3 years  
Long Term Incentive Plan 2003 | Stock Options | Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option award vesting period 4 years