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Pension Benefit Obligations - Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
United States      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 181.2 $ 198.1 $ 265.4
Participant contributions 0.1 0.1 0.1
Interest cost 9.7 9.8 4.7
Benefits and expenses paid (17.6) (17.2) (18.4)
Actuarial loss (gain) 13.5 (8.8) (51.9)
Plan settlements   (1.5) (1.8)
Transfers in   0.7  
Benefit obligation at end of year 186.9 181.2 198.1
International      
Change in benefit obligation:      
Benefit obligation at beginning of year 756.2 791.2 1,470.8
Service cost 0.2 0.3 0.5
Participant contributions 0.3 0.2 0.3
Interest cost 43.7 47.7 24.1
Benefits and expenses paid (47.7) (42.2) (44.3)
Actuarial loss (gain) 37.0 (112.5) (458.1)
Plan settlements (3.2) (1.5) (2.2)
Foreign currency translation (gain) loss 73.9 73.0 (199.9)
Benefit obligation at end of year $ 860.4 $ 756.2 $ 791.2