Leases (Minimum Lease Payments Expected to be Collected) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Minimum Lease Payments Expected to be Collected on Sales-type and Direct Financing Leases
2021	$ 153.9
2022	147.0
2023	142.5
2024	136.2
2025	130.7
Thereafter	608.5
Total	1,318.8
Unearned interest income	(415.8)
Lease Receivables, net	$ 903.0
Minimum Lease Payments Expected to be Collected Prior to Adoption of New Lease Guidance
2020		$ 162.5
2021		156.9
2022		145.7
2023		139.4
2024		133.2
Thereafter		715.5
Total		1,453.2
Unearned interest income		(472.3)
Lease Receivables, net		$ 980.9