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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Nov. 30, 2020
Nov. 30, 2020
Share-based compensation plans    
Exercise of stock options (in shares) 850 13,540
Employee purchases of common stock (in shares) 12,264 26,830
Average purchase price (in dollars per share) $ 139.88 $ 134.78
Directors stock compensation    
Share-based compensation plans    
Number of awards granted (in shares) 770 2,842
Grant date fair value $ 0.1 $ 0.5
Grant date fair value of shares granted in period (in dollars per share) $ 207.98 $ 184.56
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) 39 2,747
Grant date fair value   $ 0.5
Grant date fair value of shares granted in period (in dollars per share) $ 200.00 $ 170.69
Time-Vested | Restricted Stock Awards (RSA)    
Share-based compensation plans    
Number of awards granted (in shares) 4,171 42,143
Grant date fair value $ 0.8 $ 7.3
Grant date fair value of shares granted in period (in dollars per share) $ 199.39 $ 174.03
Vested and settled performance shares | Restricted Stock Units (RSU)    
Share-based compensation plans    
Grant date fair value $ 3.6 $ 11.3
Shares vested and settled (in shares) 18,196 64,948
Grant date fair value of shares settled in period (in dollars per share) $ 195.29 $ 173.33
Vested and settled performance shares | Restricted Stock Awards (RSA)    
Share-based compensation plans    
Grant date fair value $ 0.1 $ 1.4
Shares vested (in shares) 605 7,929
Grant date fair value of shares settled in period (in dollars per share) $ 201.29 $ 174.75
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