v3.25.4
Pension Plans - Schedule of Net Benefit Costs (Details) - Pension Plan - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0.0 $ 0.0
Interest cost 3.0 3.1
Expected return on plan assets (3.7) (4.0)
Amortization of unrecognized net losses 0.7 0.5
Net periodic (benefit)/cost 0.0 (0.4)
International    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.1 0.1
Interest cost 0.9 0.8
Expected return on plan assets (1.0) (0.9)
Amortization of unrecognized net losses 0.6 0.5
Net periodic (benefit)/cost $ 0.6 $ 0.5