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Earnings per Share (Tables)
 12 Months Ended
Sep. 30, 2015
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)
2015
 
2014
 
2013
 Numerator:
 
 
 
 
 
 Income from continuing operations
$
55.7

 
$
19.6

 
$
18.6

 Less: Allocation to participating securities
(1.3
)
 
(0.5
)
 
(0.7
)
 Income from continuing operations allocated to common stockholders
$
54.4

 
$
19.1

 
$
17.9

Income (loss) from discontinued operations
$
—

 
$
(0.3
)
 
$
0.7

 Less: Allocation to participating securities
—

 
—

 
(0.1
)
Income (loss) from discontinued operations allocated to common stockholders
$
—

 
$
(0.3
)
 
$
0.6

 Diluted net income
$
55.7

 
$
19.3

 
$
19.3

 Less: Allocation to participating securities
(1.3
)
 
(0.5
)
 
(0.8
)
Diluted net income allocated to common stockholders
$
54.4

 
$
18.8

 
$
18.5

 Denominator:
 
 
 
 
 
 Weighted average number of:
 
 
 
 
 
 Common shares outstanding
18,525,374

 
18,528,302

 
18,443,233

 Dilutive potential common shares outstanding:
 
 
 
 
 
 Share-based awards
406,861

 
604,000

 
625,264

 Diluted weighted-average shares
18,932,235

 
19,132,302

 
19,068,497