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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
United States      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 683.0 $ 720.0 $ 718.2
Service costs 4.9 4.3 4.3
Participant contributions 0.2 0.1 0.1
Interest cost 20.7 19.2 22.0
Benefits and expenses paid (37.8) (37.9) (37.4)
Actuarial (gain) loss (38.5) (22.7) 52.3
Plan settlements     (32.9)
Plan amendments 0.6   0.2
Plan curtailments     (6.8)
Benefit obligation at end of year 633.1 683.0 720.0
Foreign Pension Plan, Defined Benefit      
Change in benefit obligation:      
Benefit obligation at beginning of year 1,333.5 1,406.2 1,239.2
Service costs 1.1 1.3 1.0
Participant contributions 0.4 0.4 0.5
Interest cost 32.0 28.3 39.2
Benefits and expenses paid (53.7) (48.3) (41.9)
Actuarial (gain) loss (87.7) (98.6) 377.1
Plan settlements (3.0)   (0.7)
Plan curtailments (0.1)    
Foreign currency translation (gain) loss (33.7) 44.2 (208.2)
Benefit obligation at end of year $ 1,188.8 $ 1,333.5 $ 1,406.2