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Stock-Based Compensation Plans - Restricted Share Unit Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2021
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Apr. 30, 2014
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Common shares reserved for future issuance         2,850,000
Additional shares reserved for future issuance 2,015,000        
Certain officers and employees          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Minimum Percent Of Weighted Average Price Of Common Shares Over Any Consecutive 15 Day Period Of Book Value Of One Share Of Company       95.00%  
Restricted shares          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Unrecognized compensation cost   $ 5.6      
Weighted average life over which unrecognized compensation is expected to be recognized   1 year 2 months 8 days      
Fair value of restricted share vested during the period   $ 13.0 $ 10.5 $ 4.8  
Incentive Share/Unit Awards          
Unvested as of April 1st   307,873 328,382    
Granted   325,851 341,650    
Vested   (360,728) (362,159)    
Unvested as of March 31st   272,996 307,873 328,382  
Weighted-Average Grant-Date Fair Value          
Unvested as of April 1st   $ 23.16 $ 11.79    
Granted   35.81 29.81    
Vested   26.95 19.13    
Unvested as of March 31st   $ 36.06 $ 23.16 $ 11.79  
Restricted shares | General and Administrative Expenses          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Stock-based compensation expense   $ 10.4 $ 8.3 $ 4.3  
Restricted shares | Certain officers and employees          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Shares granted   16,000      
Shares granted vesting on first, second and third anniversary of grant date     229,750 47,750  
Shares granted vesting on first and second anniversary of grant date   231,150 35,000 165,500  
Restricted shares | Non-executive director          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Shares granted   29,741 31,400 34,695  
Restricted Stock Units | Certain officers and employees          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Shares granted vesting on first and second anniversary of grant date   48,960 45,500 53,100