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Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted Average Remaining Contractual Life      
Excess tax benefit classified as financing cash flow $ 22.0 $ 7.1 $ 10.1
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) 100,000    
Options exercised (in shares) (1,400,000)    
Options forfeited (in shares) 0    
Unexercised options outstanding at the end of the period (in shares) 3,800,000 5,100,000  
Exercisable at the end of the period (in shares) 2,500,000    
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) $ 121.90    
Options exercised (in dollars per share) $ 54.45    
Options forfeited (in dollars per share) $ 85.72    
Unexercised options outstanding at the end of the period (in dollars per share) $ 74.04 $ 68.18  
Exercisable at the end of the period (in dollars per share) $ 68.64    
Weighted Average Remaining Contractual Life      
Unexercised options outstanding at the end of the period 4 years 1 month 7 days    
Exercisable at the end of the period 3 years 7 months 6 days    
Total intrinsic value of options exercised 86.8 35.4 42.3
Intrinsic value of exercisable options 154.2    
Options available for future grant under the Company's option plans (in shares) 3,449,781    
Cash received for options exercised 73.4 28.0  
Actual tax benefit recognized for options exercised 25.5 8.2  
Excess tax benefit classified as financing cash flow 22.0 7.1  
Stock Option and Incentive Plan | Minimum
      
Stock option and incentive plans      
Vesting period of grants 3 years    
Expiration period of grants 7 years    
Stock Option and Incentive Plan | Maximum
      
Stock option and incentive plans      
Vesting period of grants 5 years    
Expiration period of grants 10 years    
Long-Term Executive Incentive and Deferred Compensation Plans
      
Weighted Average Remaining Contractual Life      
Aggregate fair value of awards 18.1 3.3 1.0
Long-Term Equity Incentive Plan
      
Weighted Average Remaining Contractual Life      
Aggregate fair value of awards $ 25.9 $ 14.6 $ 21.0