Income Taxes (Components of the Income Taxes Provision) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Current Tax Provision
Federal	$ 167.6	$ 149.1	$ 85.6
State	41.0	30.1	28.4
Foreign	367.3	289.3	254.8
Total current tax provision	575.9	468.5	368.8
Deferred Tax (Benefit) Provision
Federal	(12.5)	15.6	54.7
State	(5.8)	(1.9)	(0.1)
Foreign	(6.4)	18.6	39.4
Total Deferred Tax (Benefit) Provision	(24.7)	32.3	94.0
Total Income Tax Provision	$ 551.2	$ 500.8	$ 462.8