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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Nov. 30, 2019
Nov. 30, 2019
Share-based compensation plans    
Exercise of stock options (in shares) 6,892 68,657
Employee purchases of common stock (in shares) 15,013 29,803
Average purchase price (in dollars per share) $ 95.03 $ 95.16
Directors stock compensation    
Share-based compensation plans    
Number of awards granted (in shares) 904 3,208
Grant date fair value $ 0.1 $ 0.3
Grant date fair value of shares granted in period (in dollars per share) $ 155.13 $ 131.33
Restricted Stock Units (RSU)    
Share-based compensation plans    
Grant date fair value $ 3.1 $ 10.7
Shares vested and settled (in shares) 20,449 86,778
Grant date fair value of shares settled in period (in dollars per share) $ 153.63 $ 123.79
Shares vested (in shares) 20,449 86,778
Restricted Stock Awards (RSA)    
Share-based compensation plans    
Shares vested (in shares) 44,000 972,000
Performance Restricted Stock Units (PSU)    
Share-based compensation plans    
Number of awards granted (in shares) 0 6,088
Grant date fair value   $ 0.7
Grant date fair value of shares granted in period (in dollars per share)   $ 110.85
Shares vested (in shares) 0 108,572
Performance Based Restricted Stock Awards (PSA)    
Share-based compensation plans    
Number of awards granted (in shares) 0 122,402
Grant date fair value   $ 13.6
Grant date fair value of shares settled in period (in dollars per share)   $ 110.85
Time-Vested | Restricted Stock Units (RSU)    
Share-based compensation plans    
Number of awards granted (in shares) 390 3,669
Grant date fair value $ 0.1 $ 0.4
Grant date fair value of shares granted in period (in dollars per share) $ 153.75 $ 116.00
Time-Vested | Restricted Stock Awards (RSA)    
Share-based compensation plans    
Number of awards granted (in shares) 506 46,278
Grant date fair value $ 0.1 $ 5.3
Grant date fair value of shares granted in period (in dollars per share) $ 147.61 $ 114.35
Vested and settled performance shares | Restricted Stock Awards (RSA)    
Share-based compensation plans    
Grant date fair value   $ 0.1
Grant date fair value of shares granted in period (in dollars per share) $ 150.86  
Shares vested and settled (in shares) 44 972
Vested and settled performance shares | Performance Restricted Stock Units (PSU)    
Share-based compensation plans    
Grant date fair value   $ 14.7
Grant date fair value of shares granted in period (in dollars per share)   $ 135.85
Shares vested and settled (in shares) 0 108,572