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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Feb. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 4 years 8 months 12 days [1] 4 years 7 months 6 days [1]  
Capitalized share based compensation 0 $ 0  
Purchase of granted nonqualified options 2,233,624 1,933,690  
Weighted average fair values of grant for options per share 12.68 $ 13.84  
Unrecognized compensation costs related to nonvested options/MSUs 41.9    
Weighted average period, years 2 years 6 months    
Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options expiration term (in years) 10 years    
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options 12.6 14.0  
Cash received as a result of stock option exercises 12.6 14.0  
Total intrinsic value of options exercised 12.2 13.2  
Related tax benefits 4.9 5.2  
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 3 years    
Stock units granted, number of units 0    
Related tax benefits   10.9  
Awards outstanding 0   0
Cash-Settled Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options 17.9    
Stock units granted, number of units 644,232 575,380  
Cash received as a result of stock option exercises 17.9    
Related tax benefits 7.1    
Awards outstanding 1,721,000   1,915,000
Restricted stock granted, weighted average grant date fair value 31.76 $ 32.69  
Stock-Settled Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Conversion ratio, number of final trading days in vesting period 40 days    
Stock units granted, number of units 346,551 292,946  
Related tax benefits 9.5    
Awards outstanding 904,000   950,000
Weighted average fair values of grant for options per share 40.36 $ 45.58  
Unrecognized compensation costs related to nonvested options/MSUs 19.7    
Weighted average period, years 1 year 8 months 12 days    
Restricted stock granted, weighted average grant date fair value 40.36    
Minimum [Member] | Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Minimum [Member] | Cash-Settled Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash payment per cash settled restricted stock unit 75.00%    
Minimum [Member] | Stock-Settled Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
MSUs converted to common stock 0    
Maximum [Member] | Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Maximum [Member] | Cash-Settled Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash payment per cash settled restricted stock unit 200.00%    
Maximum [Member] | Stock-Settled Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
MSUs converted to common stock 2    
[1] Represents the estimated number of years that options will be outstanding prior to exercise.