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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
United States      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 252.9 $ 232.9 $ 251.9
Participant contributions   0.1 0.2
Interest cost 6.4 8.6 7.4
Benefits and expenses paid (16.3) (15.2) (16.6)
Actuarial (gain) loss 20.7 27.8 (10.6)
Plan settlements (2.1) (1.3)  
Plan amendments     0.6
Benefit obligation at end of year 261.6 252.9 232.9
International      
Change in benefit obligation:      
Benefit obligation at beginning of year 1,311.3 1,188.7 1,333.4
Service cost 0.6 0.5 1.1
Participant contributions 0.3 0.3 0.4
Interest cost 22.4 29.7 32.0
Benefits and expenses paid (42.9) (41.2) (53.7)
Actuarial (gain) loss 82.8 206.5 (87.7)
Plan settlements (4.1) (3.7) (3.0)
Plan amendments   5.2  
Plan curtailments     (0.1)
Foreign currency translation (gain) loss 69.8 (74.7) (33.7)
Benefit obligation at end of year $ 1,440.2 $ 1,311.3 $ 1,188.7