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Share- Based Compensation Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested share-based compensation $ 110.5    
Weighted average period of recognition of unvested share-based compensation (in years) 2 years    
Share-Based Compensation Expense 73.9 70.3 52.7
2012 Stock Incentive Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock authorized for issuance under the Plan 30,000,000    
Shares available for future grant under the Plan 32,093,120    
Stock options under the Plan, the 2002 Plan, and the 1992 Plan | Upper Limit
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option maximum term (in years) 10 years    
Options vest and become exercisable after the date of grant (in years) 4 years    
Stock options under the Plan, the 2002 Plan, and the 1992 Plan | Lower Limit
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of the fair value for options to purchase common stock on the date the options are granted 100.00%    
Options vest and become exercisable after the date of grant (in years) 1 year    
Performance Stock Units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock units granted 198,552 0  
Stock units weighted average grant date fair value $ 43.65    
performance based units vesting period 3 years    
Aggregate intrinsic value of options granted 10.0    
Vesting term of units granted 3.1    
Performance Stock Units | Upper Limit
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 125.00%    
Performance Stock Units | Lower Limit
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 0.00%    
Restricted Stock Units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock units vesting description The stock units granted in 2012 predominately vest at a rate equal to 50% on the third anniversary date of the grant and 50% on the fourth anniversary date.    
Number of stock units granted 988,421 995,176 1,223,539
Stock units weighted average grant date fair value $ 43.72 $ 50.79 $ 50.67
Fair value of stock and stock units vested 21.6 7.1 19.1
Restricted Stock Units | Third Anniversary Of Grant Date
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 50.00%    
Restricted Stock Units | Fourth Anniversary Of Grant Date
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 50.00%    
Non Employee Directors, Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total value of stock awards granted 0.9 1.1 1.1
Number of stock units granted 20,148 22,188 21,131
Share-Based Compensation Expense $ 0.9 $ 1.1 $ 1.1