Leases (Presentation on Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease right-of-use assets	$ 974.0	$ 694.8
Payables and accrued liabilities	94.7	90.0
Noncurrent operating lease liabilities	631.1	592.1
Total operating lease liabilities	$ 725.8	$ 682.1
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current