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Share-Based Payments (Tables)
 3 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Restricted Stock Activity
The transactions for restricted shares and restricted share units for the three months ended December 31, 2020 were as follows:
Shares /UnitsWeighted-
average
Grant-date
Fair Value
Non-vested at September 30, 2020750,322 $40.88 
Granted499,050 30.06 
Vested(104,895)56.11 
Expired or forfeited(36,667)57.05 
Non-vested at December 31, 20201,107,810 $34.03 
Schedule of Assumptions Used in Estimating Fair Value The following table indicates the assumptions used in estimating the fair value of certain restricted share units granted during the three-month period ended December 31, 2020.
Three Months Ended
December 31, 2020
Expected volatility42.9 %
Dividend yield3.2 %
Average risk-free interest rate0.2 %
Average expected term (years)3.0