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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 432.2 | $ 432.2 | $ 1,068.8 | $ 1,026.7 |
Effective tax rate (percent) | 24.00% | 24.20% | 23.40% | 23.90% |
Deferred tax assets net of DTL | $ 171.3 |  | $ 171.3 |  | $ 202.0
Valuation allowance for deferred income taxes | $ 14.7 |  | $ 14.7 |  | $ 14.8

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