Income Taxes (Deferred Tax Assets and Liabilities Included in Consolidated Financials) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Deferred Tax Assets
Other noncurrent assets	$ 159.6	$ 135.7
Deferred Tax Liabilities
Deferred income taxes	1,266.0	1,247.4
Net Deferred Income Tax Liability	$ 1,106.4	$ 1,111.7