Leases (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 19.7	$ 59.2
Use of cash for payments on operating leases		60.0
ROU asset additions		86.0
Expected lease payments for operating leases that have not yet commenced	$ 70.0	70.0
Interest income on lease receivables		53.9
Lease payments collected during the period		123.0
Reduction in lease receivable balance		$ 69.1