v3.26.1
Benefit Plans (Projected benefit obligation exceeding the fair value of plan assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Other Defined Benefit Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 93.1 $ 90.7 $ 96.4
Defined Benefit Plan, Plan Assets, Amount 112.8 109.3 113.9
Defined Benefit Plan, Accumulated Benefit Obligation 93.1 90.7  
Defined Benefit Plan, Service Cost 0.7 0.7 0.7
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0.0 0.0 0.0
Defined Benefit Plan, Interest Cost 4.7 4.2 4.1
Defined Benefit Plan, Actuarial Net (Gains) Losses (1.9) (9.1)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 6.2 4.6  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 0.6 1.0  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 2.9 2.1  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 6.0 (4.9)  
Defined Benefit Plan, Plan Assets, Contributions by Employer 0.7 1.2  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 0.6 1.0  
Defined Benefit Plan, Plan Assets, Benefits Paid 6.0 4.5  
Defined Benefit Plan, Funded (Unfunded) Status of Plan 19.7 18.6  
Other Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 5.2 5.8 6.2
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0 0.0
Defined Benefit Plan, Service Cost 0.0 0.0 0.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0.0 0.0 0.0
Defined Benefit Plan, Interest Cost 0.3 0.3 $ 0.3
Defined Benefit Plan, Actuarial Net (Gains) Losses (0.4) (0.6)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 0.5 0.1  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 0.0 0.0  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 0.0 0.0  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0.0 0.0  
Defined Benefit Plan, Plan Assets, Contributions by Employer 0.5 0.1  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 0.0 0.0  
Defined Benefit Plan, Plan Assets, Benefits Paid 0.5 0.1  
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (5.2) $ (5.8)