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Schedule Of Estimated Fair Value Of Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 33.3 $ 34.8 $ 67.7 $ 66.9
Stock Option
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk free interest rate 0.75% 1.95% 0.81% 2.30%
Average expected term (years) 4.3 4.6 4.5 4.8
Average expected volatility 32.00% 35.00% 32.00% 35.00%
Weighted average fair value at grant date $ 149.90 $ 113.55 $ 143.50 $ 114.67
Total stock-based compensation expense 30.2 32.8 61.8 62.8
Employee Stock Purchase Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk free interest rate     0.16% 0.37%
Average expected term (years)     1.3 1.3
Average expected volatility     32.00% 35.00%
Weighted average fair value at grant date     $ 133.75 $ 97.07
Total stock-based compensation expense $ 3.1 $ 2.0 $ 5.9 $ 4.1