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Stock Option and Incentive Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Recent share based compensation expense    
Share Based Compensation Expense $ 5.0 $ 3.8
Tax Benefit 3.1 2.3
Compensation expense related to share-based compensation $ 71.8  
Weighted average period over which compensation expense will be recognized (in years) 3  
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) 5,100,000  
Options granted (in shares) 0  
Options exercised (in shares) (300,000)  
Options forfeited (in shares) 0  
Unexercised options outstanding at the end of the period (in shares) 4,800,000  
Exercisable at the end of the period (in shares) 2,700,000  
Weighted Average Exercise Price    
Unexercised options outstanding at the beginning of the period (in dollars per share) $ 68.18  
Options granted (in dollars per share) $ 107.63  
Options exercised (in dollars per share) $ 51.76  
Options forfeited (in dollars per share) $ 116.35  
Unexercised options outstanding at the end of the period (in dollars per share) $ 69.19  
Exercisable at the end of the period (in dollars per share) $ 62.91  
Weighted Average Remaining Contractual Life (years)    
Unexercised options outstanding at the end of the period (in years) 4.3  
Exercisable at the end of the period (in years) 3.6