v3.26.1
Benefit Plans (Amounts recognized in balance sheets) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Other Postretirement Benefit Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Liability, Defined Benefit Plan, Current $ (0.9) $ (1.0)
Liability, Defined Benefit Plan, Noncurrent (4.3) (4.8)
Liability, Defined Benefit Pension Plan 5.2 5.8
Assets for Plan Benefits, Defined Benefit Plan 0.0 0.0
Other Defined Benefit Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Liability, Defined Benefit Plan, Current 0.0 0.0
Liability, Defined Benefit Plan, Noncurrent (4.1) (3.3)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 19.7  
Liability, Defined Benefit Pension Plan   18.6
Assets for Plan Benefits, Defined Benefit Plan $ 23.8 $ 21.9