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Pension Benefit Obligations - Funded Status (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
United States      
Reconciliation of funded status:      
Funded status at end of year $ (96.7) $ (126.5) $ (154.3)
Net amount recognized at end of year (96.7) (126.5) (154.3)
International.      
Reconciliation of funded status:      
Funded status at end of year (107.7) (219.0) (274.1)
Net amount recognized at end of year $ (107.7) $ (219.0) $ (274.1)