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Retirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
Pension settlement gain $ 0.0 $ 1.7
U.S. Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service costs 0.0 0.0
Interest costs 0.2 0.2
Expected return on plan assets 0.0 0.0
Amortization of net loss (gain) 0.1 0.0
Pension settlement gain 0.0 1.7
Net periodic pension cost (benefit) 0.3 (1.5)
Non-U.S. Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service costs 0.8 0.7
Interest costs 0.7 0.8
Expected return on plan assets (0.3) (0.3)
Amortization of net loss (gain) 0.1 (0.2)
Pension settlement gain 0.0 0.0
Net periodic pension cost (benefit) $ 1.3 $ 1.0