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Employee Benefit Plans - Components Of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0.7 $ 0.4 $ 0.4
Interest cost 2.2 2.8 2.7
Expected return on assets (4.1) (4.4) (4.5)
Settlements and curtailments 0.9 0.0 0.0
Recognized net actuarial loss 0.9 0.2 1.1
Net periodic benefit cost $ 0.6 $ (1.0) $ (0.3)
Weighted average assumptions      
Discount rate 3.04% 4.10% 3.70%
Expected return on plan assets 6.50% 6.50% 7.00%
Non U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 2.2 $ 1.9 $ 2.0
Interest cost 2.3 3.4 3.6
Expected return on assets (3.9) (3.9) (4.2)
Settlements and curtailments 0.1 0.3 0.1
Recognized net actuarial loss 3.4 1.8 1.4
Net periodic benefit cost $ 4.1 $ 3.5 $ 2.9
Non U.S. Plans | Minimum      
Weighted average assumptions      
Discount rate 0.75% 1.00% 1.13%
Expected return on plan assets 0.75% 1.00% 1.13%
Rate of compensation increase 2.25% 2.25% 1.37%
Non U.S. Plans | Maximum      
Weighted average assumptions      
Discount rate 7.70% 8.30% 7.50%
Expected return on plan assets 3.40% 4.01% 4.13%
Rate of compensation increase 6.00% 7.00% 7.00%