Leases (Payments Collected) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Payments that reduced the lease receivable balance	$ 122.1	$ 79.6	$ 94.0
Payments recognized as interest income	42.6	49.6	59.1
Total lease payments collected	$ 164.7	$ 129.2	$ 153.1