Leases (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Operating lease expense		$ 122,400,000	$ 109,900,000	$ 105,300,000
Use of cash for payments on operating leases		154,600,000	337,800,000	128,000,000.0
Noncash ROU asset additions		159,000,000	150,000,000	$ 252,000,000
Sales-type lease, residual value of leased asset	$ 0	$ 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