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Pension Benefit Obligations - Periodic Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Pension Plan, Defined Benefit      
Components of net periodic benefit cost:      
Applicable deferred income taxes, included in OCI arising from net prior service cost and net gain/loss $ 29.7 $ 19.1 $ 27.6
United States      
Components of net periodic benefit cost:      
Service costs   4.9 4.3
Interest cost on projected benefit obligation 23.8 20.7 19.2
Expected return on plan assets (27.5) (31.5) (31.0)
Amortization of prior service costs (credits) 0.1 0.1  
Amortization of net loss 3.6 4.0 4.3
Settlement loss recognized 0.2    
Net periodic benefit cost 0.2 (1.8) (3.2)
International      
Components of net periodic benefit cost:      
Service costs 0.5 1.1 1.3
Interest cost on projected benefit obligation 29.7 32.0 28.3
Expected return on plan assets (38.1) (43.1) (41.5)
Amortization of prior service costs (credits) (0.1) (0.1) (0.2)
Amortization of net loss 4.1 8.2 13.0
Settlement loss recognized 0.8 0.3  
Net periodic benefit cost $ (3.1) $ (1.6) $ 0.9