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Pension Benefit Obligations - Periodic Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
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 $ 19.1 $ 27.6 $ 26.2
United States      
Components of net periodic (benefit) cost:      
Service costs 4.9 4.3 4.3
Interest cost on projected benefit obligation 20.7 19.2 22.0
Expected return on plan assets (31.5) (31.0) (30.8)
Amortization of prior service credits 0.1    
Amortization of net loss 4.0 4.3 4.0
Curtailment gain recognized     (6.8)
Settlement (gain) loss recognized     (0.9)
Net periodic (benefit) cost (1.8) (3.2) (8.2)
Foreign Pension Plan, Defined Benefit      
Components of net periodic (benefit) cost:      
Service costs 1.1 1.3 1.0
Interest cost on projected benefit obligation 32.0 28.3 39.2
Expected return on plan assets (43.1) (41.5) (48.0)
Amortization of prior service credits (0.1) (0.2) (0.2)
Amortization of net loss 8.2 13.0 5.4
Settlement (gain) loss recognized 0.3   0.1
Net periodic (benefit) cost $ (1.6) $ 0.9 $ (2.5)