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Earnings per Share (Tables)
 9 Months Ended
Jun. 30, 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 June 30,
 
Nine Months Ended June 30,
(in millions, except share amounts)
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net income
$
14.6

 
$
12.2

 
$
37.9

 
$
34.6

Less: Allocation to participating securities
(0.3
)
 
(0.3
)
 
(0.6
)
 
(0.8
)
Net income allocated to common stockholders
$
14.3

 
$
11.9

 
$
37.3

 
$
33.8

Diluted net income
$
14.6

 
$
12.2

 
$
37.9

 
$
34.6

Less: Allocation to participating securities
(0.3
)
 
(0.3
)
 
(0.6
)
 
(0.8
)
Diluted net income allocated to common stockholders
$
14.3

 
$
11.9

 
$
37.3

 
$
33.8

Denominator:
 
 
 
 
 
 
 
Weighted average number of:
 
 
 
 
 
 
 
Common shares outstanding
18,138,754


18,698,734

 
18,461,063

 
18,573,617

Dilutive potential common shares outstanding:
 
 
 
 
 
 
 
Share-based awards
183,697

 
386,013

 
194,609

 
379,554

Diluted weighted-average shares
18,322,451

 
19,084,747

 
18,655,672

 
18,953,171