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Pension Benefit Obligations - Funded Status (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
United States      
Reconciliation of funded status:      
Funded status at end of year $ (241.4) $ (177.6) $ (212.6)
Net amount recognized at end of year (241.4) (177.6) (212.6)
International      
Reconciliation of funded status:      
Funded status at end of year (242.5) (222.9) (340.4)
Net amount recognized at end of year $ (242.5) $ (222.9) $ (340.4)