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Retirement Plans - Weighted Average Assumptions (Details) - Pension plan - Weighted Average
Sep. 30, 2020
Sep. 30, 2019
U.S. Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount rate 2.91% 3.22%
Non-U.S. Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount rate 1.87% 1.85%
Rate of compensation increase 3.64% 3.54%