Leases (Presentation on Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Leases [Abstract]
Operating lease right-of-use assets, net	$ 944.0	$ 1,047.7
Payables and accrued liabilities	$ 91.8	$ 100.3
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Payables and accrued liabilities	Payables and accrued liabilities
Noncurrent operating lease liabilities	$ 616.0	$ 677.9
Total operating lease liabilities	$ 707.8	$ 778.2