Income Taxes (Narrative) (Details) $ in Millions	Sep. 30, 2023 USD ($) country	Sep. 30, 2022 USD ($)
Income Tax Disclosure [Abstract]
Foreign subsidiary earnings, indefinitely invested	$ 897.0
Unrecognized tax benefits that would impact effective tax rate	18.7
Unrecognized tax benefits, interest accrued	4.4	$ 4.1
Unrecognized tax benefits, deferred tax asset excluded from interest accrued	$ 0.8	$ 0.7
Number of foreign jurisdictions | country	30