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Pension Benefit Obligations - Periodic Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Pension Plan, Defined Benefit      
Percentage of Plan Assets:      
Applicable deferred income taxes, included in OCI arising from net prior service cost and net gain/loss $ 9.3 $ 15.5 $ 16.3
United States      
Percentage of Plan Assets:      
Interest cost on projected benefit obligation 4.3 6.8 9.5
Expected return on plan assets (6.5) (7.0) (9.0)
Amortization of prior service costs (credits)   0.1 0.1
Amortization of net loss 5.9 4.7 3.7
Curtailment loss recognized   0.5  
Settlement loss recognized 0.2 0.6 0.2
Net periodic benefit cost 3.9 5.7 4.5
International      
Percentage of Plan Assets:      
Service costs 0.5 0.6 0.5
Interest cost on projected benefit obligation 21.6 22.4 29.7
Expected return on plan assets (43.5) (37.5) (38.1)
Amortization of prior service costs (credits) 0.1 0.1 (0.1)
Amortization of net loss 9.2 8.6 4.1
Settlement loss recognized 0.8 0.5 0.8
Net periodic benefit cost $ (11.3) $ (5.3) $ (3.1)