Retirement Plans (Schedule of Fair Value of Plan Assets Measured at NAV) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 417.8	$ 412.3
Cost of products sold	1,298.6	1,298.0	$ 1,310.8
Fair value measured at net asset value per share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	244.0	251.7
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	173.8	160.6
Non-US equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49.5	45.5
Non-US equity securities | Fair value measured at net asset value per share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20.4	22.5
Non-US equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49.5	45.5
US Government Agencies Debt Securities | Fair value measured at net asset value per share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	67.7	64.9
Fair value measured at net asset value per share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	244.0	251.7
Defined Benefit Plan, Equity Securities, US, Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28.5	26.9
Defined Benefit Plan, Equity Securities, US, Large Cap | Fair value measured at net asset value per share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36.7	53.0
Defined Benefit Plan, Equity Securities, US, Large Cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28.5	26.9
Debt Security, Corporate, US
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	90.1	83.4
Debt Security, Corporate, US | Fair value measured at net asset value per share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	119.2	111.3
Debt Security, Corporate, US | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	90.1	83.4
Defined Benefit Plan, Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.7	4.8
Defined Benefit Plan, Cash | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 5.7	$ 4.8