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Earnings per Share (Tables)
 6 Months Ended
Mar. 31, 2016
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 March 31,
 
Six Months Ended March 31,
(in millions, except share amounts)
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net income
$
14.5

 
$
13.0

 
$
23.3

 
$
22.4

Less: Allocation to participating securities
(0.3
)
 
(0.3
)
 
(0.4
)
 
(0.5
)
Net income allocated to common stockholders
$
14.2

 
$
12.7

 
$
22.9

 
$
21.9

Diluted net income
$
14.5

 
$
13.0

 
$
23.3

 
$
22.4

Less: Allocation to participating securities
(0.3
)
 
(0.3
)
 
(0.4
)
 
(0.5
)
Diluted net income allocated to common stockholders
$
14.2

 
$
12.7

 
$
22.9

 
$
21.9

Denominator:
 
 
 
 
 
 
 
Weighted average number of:
 
 
 
 
 
 
 
Common shares outstanding
18,592,643


18,599,011

 
18,621,337

 
18,546,377

Dilutive potential common shares outstanding:
 
 
 
 
 
 
 
Share-based awards
162,807

 
358,769

 
200,485

 
196,656

Diluted weighted-average shares
18,755,450

 
18,957,780

 
18,821,822

 
18,743,033