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Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Numerator: |  |  |  |
Net income | $ 41.7 | $ 64.0 | $ 118.3 | $ 105.7
Less: Allocation to participating securities | (1.5) | (1.8) | (4.0) | (3.1)
Net income allocated to common stockholders | $ 40.2 | $ 62.2 | $ 114.3 | $ 102.6
Denominator: |  |  |  |
Common shares outstanding (in shares) | 19,930,027 | 19,573,871 | 19,850,052 | 19,477,540
Dilutive potential common shares outstanding: |  |  |  |
Share-based awards (in shares) | 691,167 | 438,838 | 703,861 | 452,507
Diluted weighted - average common shares (in shares) | 20,621,194 | 20,012,709 | 20,553,913 | 19,930,047

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