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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 299.1 | $ 149.5 | $ 784.1 | $ 377.6 |
Effective tax rate (percent) | 21.10% | 19.10% | 21.60% | 19.60% |
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent | 1.90% | 3.10% | 0.90% | 2.80% |
Deferred tax assets net of DTL | $ 154.4 |  | $ 154.4 |  | $ 152.4
Valuation allowance for deferred income taxes | $ 7.3 |  | $ 7.3 |  | $ 7.5

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