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Share-Based Compensation (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Recent share based compensation expense    
Share Based Compensation Expense $ 5.5 $ 5.0
Tax Benefit 3.4 3.1
Compensation expense related to share-based compensation $ 69.4  
Weighted average period over which compensation expense will be recognized 3 years  
Stock Option and Incentive Plan
    
Summary of transactions of stock option and incentive plans:    
Unexercised options outstanding at the beginning of the period (in shares) 3.8  
Options exercised (in shares) (0.5)  
Unexercised options outstanding at the end of the period (in shares) 3.3  
Exercisable at the end of the period (in shares) 2.1  
Weighted Average Exercise Price    
Unexercised options outstanding at the beginning of the period (in dollars per share) $ 74.04  
Options exercised (in dollars per share) $ 65.30  
Unexercised options outstanding at the end of the period (in dollars per share) $ 75.25  
Exercisable at the end of the period (in dollars per share) $ 69.56  
Weighted Average Remaining Contractual Life    
Unexercised options outstanding at the end of the period 4 years  
Exercisable at the end of the period 3 years 7 months 6 days