Income Taxes (Components of the Income Taxes Provision) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Current Tax Provision
Federal	$ 550.3	$ 167.6	$ 149.1
State	109.2	41.0	30.1
Foreign	354.7	367.3	289.3
Total current tax provision	1,014.2	575.9	468.5
Deferred Tax (Benefit) Provision
Federal	(97.8)	(12.5)	15.6
State	(15.0)	(5.8)	(1.9)
Foreign	43.5	(6.4)	18.6
Total Deferred Tax (Benefit) Provision	(69.3)	(24.7)	32.3
Total Income Tax Provision	$ 944.9	$ 551.2	$ 500.8