Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease expense	$ 105.3	$ 89.5	$ 80.1
Use of cash for payments on operating leases	128.0	98.8	90.0
Noncash ROU asset additions	252.0	259.0	442.0
Expected lease payments for operating leases that have not yet commenced	120.0
Interest income on lease receivables	59.1	67.4	71.2
Lease receivables, net	660.9	824.7
Lease payments collected during the period	153.1	166.2	162.8
Reduction in lease receivable balance	$ 94.0	$ 98.8	$ 91.6