Retirement Plans (Schedules of Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Sep. 30, 2025
Amounts recognized in the Consolidated Balance Sheets
Noncurrent liabilities	$ (26.2)	$ (32.7)

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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