Lease Commitments - Schedule of Lease Balances on the Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease assets	$ 266.5	$ 248.1
Accumulated depreciation	240.0	217.1
Finance Lease, Right-of-Use Asset, Accumulated Amortization	(50.0)	(34.2)
Total Operating And Finance Lease, Right-Of-Use Asset	456.5	431.0
Operating lease liabilities, current	29.2	26.8
Finance lease liabilities, current	12.3	10.6
Operating lease liabilities, noncurrent	247.3	229.2
Finance lease liabilities, noncurrent	198.9	189.8
Total Operating And Finance Lease, Liability	$ 487.7	$ 456.4
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net	Property, plant and equipment, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other noncurrent liabilities	Other noncurrent liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other noncurrent liabilities	Other noncurrent liabilities