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Share-Based Compensation Plans - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 22, 2018
shares
Feb. 29, 2024
USD ($)
plan
$ / shares
shares
Feb. 28, 2023
USD ($)
$ / shares
shares
Feb. 28, 2022
USD ($)
$ / shares
shares
Feb. 28, 2021
shares
Feb. 29, 2020
shares
Feb. 28, 2019
shares
Feb. 28, 2018
shares
Feb. 28, 2017
shares
Share-based compensation plans                  
Number of expired share based compensation plans | plan   1              
Number of active share-based compensation plans | plan   2              
New grants of options (in shares)   0 0 0 0 0 0 0 0
Exercises (in shares) | $   $ 0.3 $ 1.1 $ 3.6          
Unrecognized compensation expense | $   $ 17.1              
Weighted average period of recognition (in years)   2 years              
Target achievement as a percentage   0.00%              
The 2018 Plan                  
Share-based compensation plans                  
Number of shares of common stock covered for issuance under share-based compensation plan (in shares) 2,000,000                
Shares available for issuance (in shares)   697,829              
Employee Stock                  
Share-based compensation plans                  
Shares purchased for 2018 ESPP (in shares)   41,749              
Maximum withholding percentage of employee wages or salaries for the purchase of shares of common stock 15.00%                
Purchase price for shares acquired under the plan as a percentage of the share's fair market value 85.00%                
Restricted Stock | Directors | The 2018 Plan                  
Share-based compensation plans                  
Shares issued under plan (in shares)   7,256              
Aggregate grant date fair value of shares issued (in dollars per share) | $   $ 0.8 $ 0.8 $ 0.6          
Grant date fair value (in dollars per share) | $ / shares   $ 108.40              
Restricted Stock Awards and Restricted Stock Units                  
Share-based compensation plans                  
Award vesting period   4 years              
Restricted Stock Awards and Restricted Stock Units | Specified Grading Vesting Terms                  
Share-based compensation plans                  
Award vesting period   3 years              
Restricted Stock Awards and Restricted Stock Units | The 2018 Plan                  
Share-based compensation plans                  
Grant date fair value (in dollars per share) | $ / shares   $ 109.97 $ 195.90 $ 218.35          
Fair value of awards vested | $   $ 6.2 $ 10.2 $ 14.3          
Performance Stock Awards                  
Share-based compensation plans                  
Performance period for PSU awards   3 years              
Target percentage for performance stock awards   100.00%              
Performance Stock Awards | Cliff Vest                  
Share-based compensation plans                  
Award vesting period   3 years              
Performance Stock Awards | The 2018 Plan                  
Share-based compensation plans                  
Fair value of awards vested | $   $ 7.5 $ 37.8 $ 29.9          
Market Condition Awards                  
Share-based compensation plans                  
Grant date fair value (in dollars per share) | $ / shares   $ 80.49 $ 152.91 $ 156.08          
Performance period for PSU awards   3 years              
Target achievement as a percentage   100.00%              
Market Condition Awards | Cliff Vest                  
Share-based compensation plans                  
Award vesting period   3 years              
Minimum | Performance Stock Awards                  
Share-based compensation plans                  
Target percentage for performance stock awards   0.00%              
Minimum | Market Condition Awards                  
Share-based compensation plans                  
Target achievement as a percentage   0.00%              
Maximum | Employee Stock                  
Share-based compensation plans                  
Shares purchased for 2018 ESPP (in shares) 750,000                
Maximum | Performance Stock Awards                  
Share-based compensation plans                  
Target percentage for performance stock awards   200.00%              
Maximum | Market Condition Awards                  
Share-based compensation plans                  
Target achievement as a percentage   200.00%