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Income Taxes (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 | $ 246.0 | $ 137.3 | $ 485.1 | $ 228.1 |
Effective tax rate (percent) | 20.80% | 22.10% | 21.90% | 19.90% |
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent | 0.60% |  | 0.30% | 2.60% |
Deferred tax assets net of DTL | $ 150.2 |  | $ 150.2 |  | $ 152.4
Valuation allowance for deferred income taxes | $ 7.4 |  | $ 7.4 |  | $ 7.5

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