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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Aug. 31, 2020
Aug. 31, 2020
Share-based compensation plans    
Exercise of stock options (in shares) 4,250 12,690
Employee purchases of common stock (in shares) 0 14,566
Average purchase price (in dollars per share)   $ 130.48
Directors stock compensation    
Share-based compensation plans    
Number of awards granted (in shares) 1,008 2,072
Grant date fair value $ 0.2 $ 0.4
Grant date fair value of shares granted in period (in dollars per share) $ 180.72 $ 175.86
Performance Restricted Stock Units (PSU)    
Share-based compensation plans    
Number of awards granted (in shares) 0 4,970
Grant date fair value   $ 0.8
Grant date fair value of shares granted in period (in dollars per share)   $ 170.27
Performance Based Restricted Stock Awards (PSA)    
Share-based compensation plans    
Number of awards granted (in shares) 0 86,004
Grant date fair value   $ 14.6
Grant date fair value of shares granted in period (in dollars per share)   $ 170.27
Time-Vested | Restricted Stock Units (RSU)    
Share-based compensation plans    
Number of awards granted (in shares) 0 2,708
Grant date fair value   $ 0.5
Grant date fair value of shares granted in period (in dollars per share)   $ 170.27
Time-Vested | Restricted Stock Awards (RSA)    
Share-based compensation plans    
Number of awards granted (in shares) 1,724 37,972
Grant date fair value $ 0.3 $ 6.5
Grant date fair value of shares granted in period (in dollars per share) $ 189.95 $ 171.24
Vested and settled performance shares | Restricted Stock Units (RSU)    
Share-based compensation plans    
Grant date fair value $ 0.1 $ 7.7
Shares vested and settled (in shares) 661 46,752
Grant date fair value of shares settled in period (in dollars per share) $ 185.93 $ 164.78
Vested and settled performance shares | Restricted Stock Awards (RSA)    
Share-based compensation plans    
Grant date fair value $ 0.4 $ 1.3
Shares vested (in shares) 1,862 7,324
Grant date fair value of shares settled in period (in dollars per share) $ 197.02 $ 172.56
Vested and settled performance shares | Performance Restricted Stock Units (PSU)    
Share-based compensation plans    
Grant date fair value   $ 18.6
Shares vested and settled (in shares) 0 112,720
Grant date fair value of shares settled in period (in dollars per share)   $ 164.58