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Pension Benefit Obligations - Asset Changes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Change in plan assets      
Fair value of plan assets at beginning of year $ 1,198.1    
Employer contributions 4.0 $ 7.5  
Fair value of plan assets at end of year 1,295.8 1,198.1  
United States      
Change in plan assets      
Fair value of plan assets at beginning of year 129.3 131.4 $ 136.5
Actual return on plan assets 11.7 4.5 4.3
Employer contributions 7.0 9.8 7.0
Participant contributions   0.1 0.2
Benefits and expenses paid (16.3) (15.2) (16.6)
Plan settlements (2.1) (1.3)  
Fair value of plan assets at end of year 129.6 129.3 131.4
International      
Change in plan assets      
Fair value of plan assets at beginning of year 1,068.8 965.9 993.1
Actual return on plan assets 59.5 180.3 29.3
Employer contributions 27.7 28.1 27.8
Participant contributions 0.3 0.3 0.4
Benefits and expenses paid (42.9) (41.2) (53.7)
Plan settlements (4.1) (3.7) (3.0)
Foreign currency translation gain (loss) 56.9 (60.9) (28.0)
Fair value of plan assets at end of year $ 1,166.2 $ 1,068.8 $ 965.9