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Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Numerator: |  |  |  |
Net income | $ 61.9 | $ 69.5 | $ 184.1 | $ 187.8
Less: Allocation to participating securities | (2.2) | (2.4) | (6.5) | (6.3)
Net income allocated to common stockholders, basic | 59.7 | 67.1 | 177.6 | 181.5
Net income allocated to common stockholders, diluted | $ 59.7 | $ 67.1 | $ 177.6 | $ 181.5
Denominator: |  |  |  |
Common shares outstanding (in shares) | 30,643,270 | 30,060,251 | 30,449,286 | 29,870,136
Dilutive potential common shares outstanding: |  |  |  |
Share-based awards (in shares) | 1,099,762 | 921,200 | 1,038,084 | 997,337
Diluted weighted - average common shares (in shares) | 31,743,032 | 30,981,451 | 31,487,370 | 30,867,473

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