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Earnings per Share (Tables)
 12 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
The following is a reconciliation of the numerator and denominator of the diluted net income per share computations for the periods presented below.
 
Year Ended September 30,
(in millions, except share amounts)
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
Income from continuing operations
$
54.7

 
$
55.7

 
$
19.6

Less: Allocation to participating securities
(1.0
)
 
(1.3
)
 
(0.5
)
Income from continuing operations allocated to common stockholders
$
53.7

 
$
54.4

 
$
19.1

Loss from discontinued operations
$
—

 
$
—

 
$
(0.3
)
Less: Allocation to participating securities
—

 
—

 
—

Loss from discontinued operations allocated to common stockholders
$
—

 
$
—

 
$
(0.3
)
Diluted net income
$
54.7

 
$
55.7

 
$
19.3

Less: Allocation to participating securities
(1.0
)
 
(1.3
)
 
(0.5
)
Diluted net income allocated to common stockholders
$
53.7

 
$
54.4

 
$
18.8

Denominator:
 
 
 
 
 
Weighted average number of:
 
 
 
 
 
Common shares outstanding
18,410,561

 
18,525,374

 
18,528,302

Dilutive potential common shares outstanding:
 
 
 
 
 
Share-based awards
214,811

 
406,861

 
604,000

Diluted shares outstanding
18,625,372

 
18,932,235

 
19,132,302