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Share-Based Compensation (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Recent share based compensation expense    
Compensation expense related to share-based compensation $ 72.1 $ 79.3
Weighted average period over which compensation expense will be recognized 3 years  
Option outstanding expected to expire in 2014 0.1  
Stock Option and Incentive Plan [Member]
    
Summary of transactions of stock option and incentive plans:    
Unexercised options outstanding at the beginning of the period (in shares) 3.0  
Options exercised (in shares) (0.1)  
Options forfeited (in shares) (0.1)  
Unexercised options outstanding at the end of the period (in shares) 2.8  
Exercisable at the end of the period (in shares) 2.3  
Weighted Average Exercise Price    
Unexercised options outstanding at the beginning of the period (in dollars per share) $ 77.71  
Options exercised (in dollars per share) $ 71.38  
Options forfeited (in dollars per share) $ 79.37  
Unexercised options outstanding at the end of the period (in dollars per share) $ 77.90  
Exercisable at the end of the period (in dollars per share) $ 73.80  
Weighted Average Remaining Contractual Life (years)    
Unexercised options outstanding at the end of the period 3 years 2 months 12 days  
Exercisable at the end of the period 3 years