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Pension Benefit Obligations - Asset Changes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Change in plan assets      
Fair value of plan assets at beginning of year $ 784.9    
Employer contributions 3.0 $ 2.9  
Fair value of plan assets at end of year 772.1 784.9  
United States      
Change in plan assets      
Fair value of plan assets at beginning of year 101.4 138.9 $ 129.6
Actual return on plan assets 7.8 (27.2) 14.7
Employer contributions 8.2 9.8 13.7
Participant contributions 0.1 0.1 0.1
Benefits and expenses paid (17.2) (18.4) (18.5)
Plan settlements (1.5) (1.8) (0.7)
Fair value of plan assets at end of year 98.8 101.4 138.9
International      
Change in plan assets      
Fair value of plan assets at beginning of year 683.5 1,251.8 1,166.2
Actual return on plan assets (54.2) (374.5) 61.1
Employer contributions 24.8 23.6 25.2
Participant contributions 0.2 0.3 0.3
Benefits and expenses paid (42.2) (44.3) (48.6)
Plan settlements (1.5) (2.2) (5.9)
Foreign currency translation (loss) gain 62.7 (171.2) 53.5
Fair value of plan assets at end of year $ 673.3 $ 683.5 $ 1,251.8