Leases (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Aug. 31, 2023	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Lessee, Lease, Description [Line Items]
Operating lease expense		$ 124,000,000.0	$ 122,400,000	$ 109,900,000
Use of cash for payments on operating leases		125,200,000	154,600,000	337,800,000
Noncash ROU asset additions		65,000,000	$ 159,000,000	150,000,000
Sales-type lease, residual value of leased asset		$ 0
Variable Interest Entity, Primary Beneficiary | Land | NEOM Green Hydrogen Company
Lessee, Lease, Description [Line Items]
Use of cash for payments on operating leases	$ 209,000,000			$ 209,000,000