v3.26.1
Stock-Based Compensation, Restricted Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Restricted Stock [Abstract]      
Stock-based compensation expense (benefit) $ 22.1 $ 26.4 $ 10.8
Restricted Stock      
Restricted Stock [Abstract]      
Stock-based compensation expense (benefit) 5.7 8.0 5.3
Fair value of awards vesting 6.6 $ 6.3 4.6
Unrecognized compensation costs $ 8.1    
Weighted average period recognized 1 year 8 months 12 days    
Restricted Stock Activity [Roll Forward]      
Non-vested balance, beginning of year (in shares) 0.3    
Granted (in shares) 0.1    
Vested (in shares) (0.2)    
Forfeited (0.1)    
Non-vested balance, end of year (in shares) 0.1 0.3  
Weighted Average Price [Rollforward]      
Non-vested balance, beginning of year (in dollars per share) $ 42.9    
Granted (in dollars per share) 136.97    
Vested (in dollars per share) 35.75    
Forfeited (in dollars per share) 60.88    
Non-vested balance, end of year (in dollars per share) $ 107.65 $ 42.9  
Restricted Stock | Awards Granted in Fiscal 2026      
Restricted Stock [Abstract]      
Award vesting period 3 years    
Restricted Stock | Awards Granted in Fiscal 2026 | Tranche One      
Restricted Stock [Abstract]      
Annual vesting percentage 33.00%    
Restricted Stock | Awards Granted in Fiscal 2026 | Tranche Two      
Restricted Stock [Abstract]      
Annual vesting percentage 33.00%    
Restricted Stock | Awards Granted in Fiscal 2026 | Tranche Three      
Restricted Stock [Abstract]      
Annual vesting percentage 34.00%    
Restricted Stock | Non-employee directors      
Restricted Stock [Abstract]      
Award vesting period 1 year    
Performance Stock Awards      
Restricted Stock [Abstract]      
Stock-based compensation expense (benefit) $ 16.3 $ 16.7 $ 4.5
Unrecognized compensation costs $ 20.4    
Weighted average period recognized 1 year 7 months 6 days    
Award vesting period 3 years    
Performance Stock Awards | Awards Granted in Fiscal 2026      
Performance-Based Shares [Abstract]      
Performance period 3 years    
Performance Stock Awards | Awards Granted in Fiscal 2025      
Performance-Based Shares [Abstract]      
Performance period 3 years    
Performance Stock Awards | Awards Granted in Fiscal 2024      
Performance-Based Shares [Abstract]      
Period of time to average cash flow return on invested capital 3 years    
Period of time to average EBITDA growth 3 years