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Earnings per Share (Tables) | 6 Months Ended
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Mar. 31, 2018
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 earnings per share computations for the periods presented below.
| Three Months Ended March 31, |  | Six Months Ended March 31,
(in millions, except share amounts) | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net income | $ | 22.7 |  |  | $ | 11.0 |  |  | $ | 15.8 |  |  | $ | 17.3 |
Less: Allocation to participating securities | (0.3 | ) |  | (0.2 | ) |  | (0.3 | ) |  | (0.3 | )
Net income allocated to common stockholders | $ | 22.4 |  |  | $ | 10.8 |  |  | $ | 15.5 |  |  | $ | 17.0 |
Denominator: |  |  |  |  |  |  |
Weighted average number of: |  |  |  |  |  |  |
Common shares outstanding | 18,559,849 |  |  | 18,404,236 |  |  | 18,502,795 |  |  | 18,325,383 |
Dilutive potential common shares outstanding: |  |  |  |  |  |  |
Share-based awards | 299,484 |  |  | 257,182 |  |  | 333,418 |  |  | 312,097 |
Diluted weighted-average common shares | 18,859,333 |  |  | 18,661,418 |  |  | 18,836,213 |  |  | 18,637,480 |

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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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