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Pension Benefit Obligations - Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
United States      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 198.1 $ 265.4 $ 283.9
Participant contributions 0.1 0.1 0.1
Interest cost 9.8 4.7 4.3
Benefits and expenses paid (17.2) (18.4) (18.5)
Actuarial (gain) loss (8.8) (51.9) (3.7)
Plan settlements (1.5) (1.8) (0.7)
Transfers in 0.7    
Benefit obligation at end of year 181.2 198.1 265.4
International      
Change in benefit obligation:      
Benefit obligation at beginning of year 791.2 1,470.8 1,440.3
Service cost 0.3 0.5 0.5
Participant contributions 0.2 0.3 0.3
Interest cost 47.7 24.1 21.6
Benefits and expenses paid (42.2) (44.3) (48.6)
Actuarial (gain) loss (112.5) (458.1) (4.7)
Plan settlements (1.5) (2.2) (5.9)
Plan amendments     0.4
Foreign currency translation (gain) loss 73.0 (199.9) 66.9
Benefit obligation at end of year $ 756.2 $ 791.2 $ 1,470.8