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Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Numerator: |  |  |  |
Net income | $ 55.3 | $ 39.3 | $ 74.8 | $ 55.6
Less: Allocation to participating securities | (1.7) | (0.9) | (2.2) | (1.2)
Net income allocated to common stockholders | $ 53.6 | $ 38.4 | $ 72.6 | $ 54.4
Denominator: |  |  |  |
Common shares outstanding (in shares) | 19,112,216 | 18,872,937 | 19,025,604 | 18,811,268
Dilutive potential common shares outstanding: |  |  |  |
Share-based awards (in shares) | 558,323 | 317,016 | 544,424 | 321,229
Diluted weighted - average common shares (in shares) | 19,670,539 | 19,189,953 | 19,570,028 | 19,132,497

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