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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 9.2 | $ 3.3 | $ 16.3 | $ 8.7 |
Effective income tax rate, percent | 24.50% | 24.10% | 24.40% | 24.30% |
Valuation allowance, deferred tax asset, amount | $ 1.3 |  | $ 1.3 |  | $ 1.5
Deferred Income Tax Liabilities, Net | (7.4) |  | (7.4) |  | (5.7)
Deferred Income Tax Liabilities, Net of Deferred Income Tax Assets | $ (6.1) |  | $ (6.1) |  | $ (4.2)

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