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Pension Benefit Obligations - Funded Status (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
United States      
Reconciliation of funded status:      
Funded status at end of year $ (77.9) $ (82.4) $ (96.7)
Net amount recognized at end of year (77.9) (82.4) (96.7)
International      
Reconciliation of funded status:      
Funded status at end of year (56.1) (82.9) (107.7)
Net amount recognized at end of year $ (56.1) $ (82.9) $ (107.7)