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Defined Benefit Pension and Other Postretirement Plans (Tables)
3 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Components of Net Periodic Pension Cost Net periodic pension cost includes the following components:
   
Three Months Ended December 31,20212020
Service cost$$
Interest cost
Expected return on assets(12)(10)
Amortization of:
Actuarial loss
Net cost$— $