Leases (Payments Collected) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Payments that reduced the lease receivable balance	$ 56.2	$ 122.1	$ 79.6
Payments recognized as interest income	32.6	42.6	49.6
Total lease payments collected	$ 88.8	$ 164.7	$ 129.2