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Earnings per Share (Tables)
 3 Months Ended
Dec. 31, 2015
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 net income per share computations for the periods presented below.
 
Three Months Ended December 31,
(in millions, except share amounts)
2015
 
2014
Numerator:
 
 
 
Net income
$
8.8

 
$
9.4

Less: Allocation to participating securities
(0.1
)
 
(0.2
)
Net income allocated to common stockholders
$
8.7

 
$
9.2

Diluted net income
$
8.8

 
$
9.4

Less: Allocation to participating securities
(0.1
)
 
(0.2
)
Diluted net income allocated to common stockholders
$
8.7

 
$
9.2

Denominator:
 
 
 
Weighted average number of:
 
 
 
Common shares outstanding
18,648,150

 
18,515,528

Dilutive potential common shares outstanding:

 

Share-based awards
343,753

 
246,501

Diluted weighted-average shares
18,991,903

 
18,762,029