Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation, pension plans	$ 415.1	$ 439.0
Percent of total pension plan assets - U.S.	67.00%
Defined contribution plan, company match percentage	100.00%
Defined contribution plan, company match, percentage of employees pay	6.00%
Defined contribution plan, cost recognized	$ 10.6	$ 11.3	$ 11.3
Expected defined benefit plan contributions, fiscal 2025	5.6
Expected defined benefit plan contributions, fiscal 2026	3.6
Expected defined benefit plan contributions, fiscal 2027	2.7
Expected defined benefit plan contributions, fiscal 2028	2.4
Expected defined benefit plan contributions, fiscal 2029	$ 2.2
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Broad target allocations	31.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Broad target allocations	69.00%
Common stock
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, amount of employer securities included in plan assets	$ 0.0