Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Accrued liabilities	$ 38.6	$ 30.1
Deferred and stock-related compensation	11.2	10.8
Tax loss carryforwards and tax credits	18.8	22.2
Intangible assets	2.7	2.6
Pension plans	7.5	6.2
Inventory differences and other tax assets	20.8	14.7
Operating lease assets	24.3	24.0
Interest expense limited under Sec 163j	117.0	110.6
Gross deferred tax assets	240.9	221.2
Depreciation and property differences	(22.2)	(25.2)
Intangible assets	(85.8)	(87.8)
Deferred Tax Liabilities, Operating Lease, Liability	(24.1)	(23.8)
Other tax liabilities	(26.8)	(28.9)
Gross deferred tax liabilities	(158.9)	(165.7)
Valuation allowance	(6.0)	(11.6)
Net deferred tax assets/(liabilities)	$ 76.0	$ 43.9