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Share-Based Compensation Plans (Details)
$ / shares in Units, $ in Millions
3 Months Ended
May 31, 2020
USD ($)
$ / shares
shares
Share-based compensation plans  
Exercise of stock options (in shares) 8,440
Employee purchases of common stock (in shares) 14,566
Average purchase price (in dollars per share) | $ / shares $ 130.48
Directors stock compensation  
Share-based compensation plans  
Number of awards granted (in shares) 1,064
Grant date fair value | $ $ 0.2
Grant date fair value of shares granted in period (in dollars per share) | $ / shares $ 171.25
Restricted Stock Units (RSU)  
Share-based compensation plans  
Shares vested and settled (in shares) 46,091
Restricted Stock Awards (RSA)  
Share-based compensation plans  
Shares vested (in shares) 5,462
Performance Restricted Stock Units (PSU)  
Share-based compensation plans  
Number of awards granted (in shares) 4,970
Grant date fair value | $ $ 0.8
Grant date fair value of shares granted in period (in dollars per share) | $ / shares $ 170.27
Shares vested and settled (in shares) 112,720
Performance Based Restricted Stock Awards (PSA)  
Share-based compensation plans  
Number of awards granted (in shares) 86,004
Grant date fair value | $ $ 14.6
Grant date fair value of shares granted in period (in dollars per share) | $ / shares $ 170.27
Time-Vested | Restricted Stock Units (RSU)  
Share-based compensation plans  
Number of awards granted (in shares) 2,708
Grant date fair value | $ $ 0.5
Grant date fair value of shares granted in period (in dollars per share) | $ / shares $ 170.27
Time-Vested | Restricted Stock Awards (RSA)  
Share-based compensation plans  
Number of awards granted (in shares) 36,248
Grant date fair value | $ $ 6.2
Grant date fair value of shares granted in period (in dollars per share) | $ / shares $ 170.35
Vested and settled shares | Restricted Stock Units (RSU)  
Share-based compensation plans  
Grant date fair value | $ $ 7.6
Grant date fair value of shares settled in period (in dollars per share) | $ / shares $ 164.48
Vested and settled shares | Restricted Stock Awards (RSA)  
Share-based compensation plans  
Grant date fair value | $ $ 0.9
Vested and settled shares | Performance Restricted Stock Units (PSU)  
Share-based compensation plans  
Grant date fair value | $ $ 18.6
Grant date fair value of shares settled in period (in dollars per share) | $ / shares $ 164.58
Vested | Restricted Stock Awards (RSA)  
Share-based compensation plans  
Grant date fair value of shares settled in period (in dollars per share) | $ / shares $ 164.23