Leases (Narrative) (Details) $ in Millions	3 Months Ended
	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 19.4
Use of cash for payments on operating leases	19.0
Interest income on lease receivables	18.5
Lease payments collected during the period	42.0
Reduction in lease receivable balance	23.5
Largest lease not yet commenced
Lessee, Lease, Description [Line Items]
Annual fixed payments, in excess of	$ 1.0
Term of lease not yet commenced (in years)	40 years