Leases (Schedule of Lease Income Related to Company's Operating and Finance Leases) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Lease income – Operating leases		$ 197.8	$ 203.3
Variable lease income – Operating leases	[1]	12.0	14.4
Rental income on operating leases		209.8	217.7
Interest income - Sales type and direct financing leases		43.7	49.2
Variable lease income included in Other non-interest income	[2]	10.9	11.5
Leveraged lease income		2.6	1.9
Total lease income		$ 267.0	$ 280.3

[1] Primarily includes per diem railcar operating lease rental income earned on a time or mileage usage basis.

[2] Includes leased equipment property tax reimbursements due from customers of $4.6 million and $6.1 million for the quarters ended March 31, 2020 and 2019, respectively, and revenue related to insurance coverage on Business Capital leased equipment of $6.3 million and $5.4 million for the quarters ended March 31, 2020 and 2019, respectively.