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Pension Benefit Obligations - Funded Status (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
United States      
Reconciliation of funded status:      
Funded status at end of year $ (132.0) $ (123.6) $ (101.5)
Net amount recognized at end of year (132.0) (123.6) (101.5)
International      
Reconciliation of funded status:      
Funded status at end of year (274.0) (242.5) (222.8)
Net amount recognized at end of year $ (274.0) $ (242.5) $ (222.8)