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Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Numerator: |  |  |  |
Net income | $ 71.7 | $ 53.1 | $ 156.8 | $ 122.2
Less: Allocation to participating securities | (2.1) | (1.9) | (4.8) | (4.3)
Net income allocated to common stockholders, basic | 69.6 | 51.2 | 152.0 | 117.9
Net income allocated to common stockholders, diluted | $ 69.6 | $ 51.2 | $ 152.0 | $ 117.9
Denominator: |  |  |  |
Common shares outstanding (in shares) | 46,789,431 | 45,710,784 | 46,602,574 | 45,529,236
Dilutive potential common shares outstanding: |  |  |  |
Share-based awards (in shares) | 2,586,992 | 1,537,630 | 2,378,871 | 1,531,372
Diluted weighted-average common shares (in shares) | 49,376,423 | 47,248,414 | 48,981,445 | 47,060,608

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