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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
United States      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 633.1 $ 683.0 $ 720.0
Service costs   4.9 4.3
Participant contributions 0.2 0.2 0.1
Interest cost 23.8 20.7 19.2
Benefits and expenses paid (36.0) (37.8) (37.9)
Actuarial (gain) loss 80.7 (38.5) (22.7)
Plan settlements (1.3)    
Plan amendments   0.6  
Benefit obligation at end of year 700.5 633.1 683.0
International      
Change in benefit obligation:      
Benefit obligation at beginning of year 1,188.8 1,333.5 1,406.2
Service costs 0.5 1.1 1.3
Participant contributions 0.3 0.4 0.4
Interest cost 29.7 32.0 28.3
Benefits and expenses paid (41.2) (53.7) (48.3)
Actuarial (gain) loss 206.5 (87.7) (98.6)
Plan settlements (3.7) (3.0)  
Plan amendments 5.2    
Plan curtailments   (0.1)  
Foreign currency translation (gain) loss (74.8) (33.7) 44.2
Benefit obligation at end of year $ 1,311.3 $ 1,188.8 $ 1,333.5