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Pension Benefit Obligations - Schedule of Reconciliations of Changes In Fair Value of Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Change in plan assets      
Fair value of plan assets at beginning of year $ 913.3    
Employer contributions 2.7 $ 2.5  
Fair value of plan assets at end of year   913.3  
U.S.      
Change in plan assets      
Fair value of plan assets at beginning of year 109.0 98.8 $ 101.4
Actual return on plan assets 3.0 15.8 7.8
Employer contributions 10.6 11.9 8.2
Participant contributions 0.1 0.1 0.1
Benefits and expenses paid (17.1) (17.6) (17.2)
Plan settlements (0.7) 0.0 (1.5)
Foreign currency translation gain 0.0 0.0 0.0
Fair value of plan assets at end of year 104.9 109.0 98.8
Int’l      
Change in plan assets      
Fair value of plan assets at beginning of year 804.3 673.3 683.5
Actual return on plan assets (15.1) 89.0 (54.2)
Employer contributions 23.7 25.1 24.8
Participant contributions 0.2 0.3 0.2
Benefits and expenses paid (46.2) (47.7) (42.2)
Plan settlements 0.0 (3.2) (1.5)
Foreign currency translation gain 5.0 67.5 62.7
Fair value of plan assets at end of year $ 771.9 $ 804.3 $ 673.3