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Pension Benefit Obligations - Asset Changes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Change in plan assets      
Fair value of plan assets at beginning of year $ 1,390.7    
Employer contributions 2.9 $ 3.7  
Fair value of plan assets at end of year 784.9 1,390.7  
United States      
Change in plan assets      
Fair value of plan assets at beginning of year 138.9 129.6 $ 129.3
Actual return on plan assets (27.2) 14.7 11.7
Employer contributions 9.8 13.7 9.1
Participant contributions 0.1 0.1  
Benefits and expenses paid (18.4) (18.5) (18.4)
Plan settlements (1.8) (0.7) (2.1)
Fair value of plan assets at end of year 101.4 138.9 129.6
International.      
Change in plan assets      
Fair value of plan assets at beginning of year 1,251.8 1,166.2 1,068.8
Actual return on plan assets (374.5) 61.1 59.5
Employer contributions 23.6 25.2 27.7
Participant contributions 0.3 0.3 0.3
Benefits and expenses paid (44.3) (48.6) (42.9)
Plan settlements (2.2) (5.9) (4.1)
Foreign currency translation (loss) gain (171.2) 53.5 56.9
Fair value of plan assets at end of year $ 683.5 $ 1,251.8 $ 1,166.2