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Share-Based Compensation (Additional Information) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Stock-based compensation      
Net proceeds from share-based compensation arrangements $ 251.7 $ 297.2 $ 551.6
Excess tax benefit from share-based compensation arrangements 300.5 250.6 169.4
Options      
Stock-based compensation      
Total fair value of shares vested 266.5 211.3 159.3
Total intrinsic value of stock options exercised during the period $ 993.5 $ 946.6 $ 814.7
Ratio of stock options to RSU's in calculating the number of RSU's for employees 4    
Unrecognized compensation cost $ 640.9    
Expected weighted-average period in years of compensation cost to be recognized 2 years    
Nonvested RSUs      
Stock-based compensation      
Unrecognized compensation cost $ 325.0    
Expected weighted-average period in years of compensation cost to be recognized 1 year 4 months 24 days    
Nonvested Performance-Based RSUs      
Stock-based compensation      
Unrecognized compensation cost $ 17.9    
Expected weighted-average period in years of compensation cost to be recognized 1 year 7 months 6 days