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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Sep. 30, 2025
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ (307.5) | $ (325.0) | $ (713.5) | $ (831.0) |
Effective tax rate (percent) | 25.10% | 23.90% | 24.70% | 23.50% |
Valuation allowance for deferred income taxes | $ 14.6 |  | $ 14.6 |  | $ 14.6
Deferred tax liability, net | 43.4 |  | 43.4 |  | 0.0
Deferred tax asset, net | $ 0.0 |  | $ 0.0 |  | $ 44.5

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