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Earnings per Share (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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