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Stock-Based Compensation (Tables)
3 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Activity [Table Text Block]
A summary of the stock-based awards granted during the three month periods ended December 31, 2017 and 2016 is presented below:
 
Three Months Ended December 31,
 
2017
 
2016
 
Number Granted
 
Weighted Average Grant Date Fair Value
 
Number Granted
 
Weighted Average Grant Date Fair Value
 
 
 
 
 
 
 
 
Stock options
1,355,595

 
$
7.05

 
2,830,826

 
$
7.81

Stock appreciation rights

 

 
15,693

 
8.28

Restricted stock/units
2,051,817

 
37.36

 
1,512,544

 
41.74

Performance shares
496,478

 
36.31

 
846,725

 
48.40

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
Three Months Ended
December 31,
 
2017
 
2016
Expected life of option (years)
6.5
 
4.75 & 6.5
Risk-free interest rate
2.28%
 
1.23% - 1.48%
Expected volatility of the Company’s stock
23.7%
 
24.6%
Expected dividend yield on the Company’s stock
2.78%
 
2.21%
Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block]
 
Three Months Ended
December 31,
 
2017
 
2016
Risk-free interest rate
1.92%
 
1.40%
Expected volatility of the Company’s stock
21.7%
 
21.0%