Income Taxes (Income of U.S and Foreign Operations Before Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income from Continuing Operations Before Taxes
United States income (Loss)	$ (1,911.8)	$ 2,602.5	$ 1,050.5
Foreign income	823.4	1,571.0	1,227.6
Equity affiliates' income	647.7	647.7	604.3
Income (Loss) From Continuing Operations Before Taxes	$ (440.7)	$ 4,821.2	$ 2,882.4