v2.4.0.6
Share-Based Compensation Expense and Effect on Diluted Earnings Per Common Share (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Compensation Related Costs Share Based Payments Disclosure [Line Items]      
Share-based compensation expense $ 86.2 $ 83.1 $ 112.9
After tax $ 59.2 $ 56.2 $ 76.1
Earnings per common share-diluted $ 0.05 $ 0.05 $ 0.07