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Stock Option and Incentive Plans (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Y
Jun. 30, 2011
Recent share based compensation expense        
Share Based Compensation Expense $ 4.9 $ 3.6 $ 9.9 $ 7.4
Tax Benefit 3.0 2.2 6.1 4.6
Compensation expense related to share-based compensation $ 63.9   $ 63.9  
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)     5.1  
Options granted (in shares)     0  
Options exercised (in shares)     (0.4)  
Options forfeited (in shares)     0  
Unexercised options outstanding at the end of the period (in shares) 4.7   4.7  
Exercisable at the end of the period (in shares) 2.5   2.5  
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   $ 107.63  
Options exercised (in dollars per share) $ 52.02   $ 52.02  
Options forfeited (in dollars per share) $ 116.35   $ 116.35  
Unexercised options outstanding at the end of the period (in dollars per share) $ 69.68   $ 69.68  
Exercisable at the end of the period (in dollars per share) $ 63.47   $ 63.47  
Weighted Average Remaining Contractual Life (years)        
Unexercised options outstanding at the end of the period (in years) 4.1   4.1  
Exercisable at the end of the period (in years)     3.4