Leases (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 20.1	$ 39.5
Use of cash for payments on operating leases		39.1
ROU asset additions		70.0
Interest income on lease receivables		36.4
Lease payments collected during the period		83.5
Reduction in lease receivable balance		$ 47.1