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Share-Based Compensation (Narrative) (Details)
$ in Millions
 1 Months Ended 12 Months Ended
May 31, 2014
shares
Jun. 30, 2014
shares
Mar. 31, 2024
USD ($)
shares
Mar. 31, 2023
USD ($)
shares
Mar. 31, 2022
USD ($)
shares
Jun. 23, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares awarded, per employee, annual (in shares) 1,000,000 2,500,000        
Extension of plan term   10 years        
Share-based compensation expense, not yet recognized | $     $ 2.7      
Share-based compensation expense, not yet recognized, period for recognition     1 year 7 months 6 days      
Number of shares available for issuance under plan (in shares)     1,900,000      
Options granted (in shares)     131,100 197,600 234,200  
Options exercised, intrinsic value | $     $ 10.0 $ 5.0 $ 6.0  
Restricted Stock Units (RSUs) & Performance Stock Units (PSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense, not yet recognized | $     $ 9.3      
Share-based compensation expense, not yet recognized, period for recognition     1 year 8 months 12 days      
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock units granted in period (in shares)     157,100 151,000.0 170,800  
Award vesting period     3 years      
Restricted Stock Units (RSUs) | Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units, conversion ratio for securities into which each RSU may be converted     1      
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award exercisability period, from date of grant (not greater than)     10 years      
Stock Options | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     3 years      
2005 Long-term Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized for grant (in shares) 5,000,000          
Number of additional shares authorized under plan (in shares)   1,800,000        
2020 Long-term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, capital shares reserved for future issuance (in shares)           2,827,210
Number of new shares for future issuance under 2020 Long-Term Incentive Plans (in shares)           2,000,000
Number of unissued shares reserved for 2020 Long-Term Incentive Plans (in shares)           827,210