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Stock And Stock-Based Incentive Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
May 31, 2017
May 31, 2016
Share Repurchase Program    
Stock and Stock-Based Incentive Plans    
Stock Repurchase Program, Authorized Amount $ 4,550.0  
Available for repurchase, as of end of period $ 1,408.3 $ 1,266.0
Stock Option | Maximum    
Stock and Stock-Based Incentive Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 7 years  
Cash-settled restricted stock units    
Stock and Stock-Based Incentive Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Cash-settled restricted stock units | Minimum    
Stock and Stock-Based Incentive Plans    
Cash payment per cash settled restricted stock unit 75.00%  
Cash-settled restricted stock units | Maximum    
Stock and Stock-Based Incentive Plans    
Cash payment per cash settled restricted stock unit 200.00%  
Stock-settled market stock units    
Stock and Stock-Based Incentive Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Market Stock Units Converted To Common Stock Conversion Ratio Number Of Final Trading Days In Vesting Period 40 days  
Share-based Compensation Arrangement by Share-based Payment Award, Conversion Ratio Quotient 2  
Stock-settled market stock units | Minimum    
Stock and Stock-Based Incentive Plans    
Stock units converted to common stock for each unit granted 0  
Stock-settled market stock units | Maximum    
Stock and Stock-Based Incentive Plans    
Stock units converted to common stock for each unit granted 2  
Performance Shares    
Stock and Stock-Based Incentive Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Performance Shares | Minimum    
Stock and Stock-Based Incentive Plans    
PSU threshold for conversion 25.00%  
Stock units converted to common stock for each unit granted 0  
Performance Shares | Maximum    
Stock and Stock-Based Incentive Plans    
PSU threshold for conversion 200.00%  
Stock units converted to common stock for each unit granted 2  
Restricted stock awards | Minimum    
Stock and Stock-Based Incentive Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year  
Restricted stock awards | Maximum    
Stock and Stock-Based Incentive Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years