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Pension Benefit Obligations - Asset Changes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Change in plan assets      
Fair value of plan assets at beginning of year $ 1,295.8    
Employer contributions to Multiemployer Pension Plans 3.7 $ 4.0  
Fair value of plan assets at end of year 1,390.7 1,295.8  
United States      
Change in plan assets      
Fair value of plan assets at beginning of year 129.6 129.3 $ 131.4
Actual return on plan assets 14.7 11.7 4.5
Employer contributions to Multiemployer Pension Plans 13.7 9.1 12.2
Participant contributions 0.1   0.1
Benefits and expenses paid (18.5) (18.4) (17.6)
Plan settlements (0.7) (2.1) (1.3)
Fair value of plan assets at end of year 138.9 129.6 129.3
International      
Change in plan assets      
Fair value of plan assets at beginning of year 1,166.2 1,068.8 965.9
Actual return on plan assets 61.1 59.5 180.3
Employer contributions to Multiemployer Pension Plans 25.2 27.7 28.2
Participant contributions 0.3 0.3 0.3
Benefits and expenses paid (48.6) (42.9) (41.3)
Plan settlements (5.9) (4.1) (3.7)
Foreign currency translation gain (loss) 53.5 56.9 (60.9)
Fair value of plan assets at end of year $ 1,251.8 $ 1,166.2 $ 1,068.8