Income Taxes (Deferred Tax Assets and Liabilities Included in Consolidated Financials) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Deferred Tax Assets
Other noncurrent assets	$ 127.8	$ 159.6
Deferred Tax Liabilities
Deferred income taxes	1,159.9	1,266.0
Net Deferred Income Tax Liability	$ 1,032.1	$ 1,106.4