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Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Numerator: |  |  |
Net income | $ 207.1 | $ 116.3 | $ 169.6
Less: Allocation to participating securities | (6.1) | (3.5) | (4.0)
Net income allocated to common stockholders | $ 201.0 | $ 112.8 | $ 165.6
Denominator: |  |  |
Common shares outstanding (in shares) | 19,570,403 | 19,130,643 | 18,824,328
Dilutive potential common shares outstanding: |  |  |
Share-based awards (in shares) | 497,137 | 547,525 | 356,151
Diluted shares outstanding (in shares) | 20,067,540 | 19,678,168 | 19,180,479

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