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Stock-Based Incentive Plan (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized compensation expense, net of estimated forfeitures $ 63.7  
Weighted-average period over which total unrecognized compensation expense expected to be recognized (years) 1 year 9 months  
Intrinsic value of stock-based awards exercised and restricted stock units converted 34.9 56.2
Long Term Incentive2003 Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock shares reserved for issuance to employees 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  
Average remaining contractual term for options outstanding (years) 6 years 0 months 17 days  
Average remaining contractual term for options vested and expected to vest (years) 5 years 11 months 5 days  
Average remaining contractual term for options exercisable (years) 4 years 9 months 6 days  
Aggregate intrinsic value for options outstanding 85.0  
Aggregate intrinsic value for options vested and expected to vest 83.3  
Aggregate intrinsic value for options exercisable $ 75.5  
Long Term Incentive2003 Plan [Member] | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option award vesting period 3 years  
Long Term Incentive2003 Plan [Member] | Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option award vesting period 4 years