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Earnings per Share (Tables) | 12 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | 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) | 2021 |  | 2020 |  | 2019
Numerator: |  |  |  |  |
Net income | $ | 116.3 |  |  | $ | 169.6 |  |  | $ | 85.1 |
Less: Allocation to participating securities | (3.5) |  |  | (4.0) |  |  | (1.5) |
Net income allocated to common stockholders | $ | 112.8 |  |  | $ | 165.6 |  |  | $ | 83.6 |
Denominator: |  |  |  |  |
Weighted average number of: |  |  |  |  |
Common shares outstanding | 19,130,643 |  |  | 18,824,328 |  |  | 18,738,905 |
Dilutive potential common shares outstanding: |  |  |  |  |
Share-based awards | 547,525 |  |  | 356,151 |  |  | 275,490 |
Diluted shares outstanding | 19,678,168 |  |  | 19,180,479 |  |  | 19,014,395 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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