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Stock-Based Compensation (Tables)
3 Months Ended
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Activity [Table Text Block] A summary of the stock-based awards granted during the three month periods ended December 31, 2020 and 2019 is presented below:
 Three Months Ended December 31,
 20202019
Number GrantedWeighted Average Grant Date Fair ValueNumber GrantedWeighted Average Grant Date Fair Value
Stock options967,932 $9.36 1,302,729 $7.29 
Restricted stock/units1,599,552 45.61 1,695,130 41.78 
Performance shares410,934 50.53 464,234 42.53 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 Three Months Ended
December 31,
 20202019
Expected life of option (years)6.56.5
Risk-free interest rate0.6%1.67%
Expected volatility of the Company’s stock27.6%22.4%
Expected dividend yield on the Company’s stock2.28%2.49%
Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block]
 Three Months Ended
December 31,
20202019
Risk-free interest rate0.20%1.60%
Expected volatility of the Company’s stock30.9%21.8%