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Earnings per Share (Tables)
 9 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
Basic EPS has been computed by dividing net income by the weighted-average number of common shares outstanding.
The following is a reconciliation of the numerator and denominator of the diluted earnings per share computations for the periods presented below.
 
Three Months Ended June 30,
 
Nine Months Ended June 30,
(in millions, except share amounts)
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income
$
24.0

 
$
12.7

 
$
39.8

 
$
30.0

Less: Allocation to participating securities
(0.3
)
 
(0.3
)
 
(0.6
)
 
(0.6
)
Net income allocated to common stockholders
$
23.7

 
$
12.4

 
$
39.2

 
$
29.4

Denominator:
 
 
 
 
 
 
 
Weighted average number of:
 
 
 
 
 
 
 
Common shares outstanding
18,597,165


18,447,053

 
18,524,846

 
18,365,939

Dilutive potential common shares outstanding:
 
 
 
 
 
 
 
Share-based awards
379,733

 
255,075

 
351,413

 
293,199

Diluted weighted-average common shares
18,976,898

 
18,702,128

 
18,876,259

 
18,659,138