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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |
Income tax expense | $ 239.1 | $ 90.8 |
Effective tax rate (percent) | 23.10% | 17.40% |
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent |  | 5.60% |
Deferred tax assets net of DTL | $ 149.5 |  | $ 152.4
Valuation allowance for deferred income taxes | $ 7.5 |  | $ 7.5

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