Income Taxes (Cash Paid for Taxes, Net of Refunds) (Details) - USD ($) $ in Millions	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Income Tax Disclosure [Abstract]
Income tax payments, net of refunds	$ 388.8	$ 856.1

Amount, after refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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