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Pension Benefit Obligations - Asset Changes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Change in plan assets      
Fair value of plan assets at beginning of year $ 772.1    
Employer contributions 2.5 $ 3.0  
Fair value of plan assets at end of year 913.3 772.1  
United States      
Change in plan assets      
Fair value of plan assets at beginning of year 98.8 101.4 $ 138.9
Actual return on plan assets 15.8 7.8 (27.2)
Employer contributions 11.9 8.2 9.8
Participant contributions 0.1 0.1 0.1
Benefits and expenses paid (17.6) (17.2) (18.4)
Plan settlements   (1.5) (1.8)
Fair value of plan assets at end of year 109.0 98.8 101.4
International      
Change in plan assets      
Fair value of plan assets at beginning of year 673.3 683.5 1,251.8
Actual return on plan assets 89.0 (54.2) (374.5)
Employer contributions 25.1 24.8 23.6
Participant contributions 0.3 0.2 0.3
Benefits and expenses paid (47.7) (42.2) (44.3)
Plan settlements (3.2) (1.5) (2.2)
Foreign currency translation (loss) gain 67.5 62.7 (171.2)
Fair value of plan assets at end of year $ 804.3 $ 673.3 $ 683.5