Discontinued Operations (Schedule Of Condensed Statements Of Income And Cash Flow Of Discontinued Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations, net of taxes	$ 118.6	$ 0.0	$ 0.0
Total income (loss) from discontinued operations, net of taxes	208.8	(665.4)	310.0
Discontinued Operation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income	39.5	84.4	74.5
Interest expense	109.1	380.0	370.9
Provision for credit losses	0.0	15.6	1.8
Rental income on operating leases	312.5	1,236.8	1,134.4
Other non-interest income (loss)	(13.9)	37.9	73.2
Depreciation on operating lease equipment	0.0	345.6	411.4
Maintenance and other operating lease expenses	4.2	32.1	45.8
Operating expenses	(30.0)	(432.0)	(101.9)
Loss on debt extinguishment	39.0	8.3	1.1
Income from discontinued operations before provision for income taxes	155.8	145.5	349.2
Provision for income taxes	65.6	810.9	39.2
Gain on sale of discontinued operations, net of taxes	118.6	0.0	0.0
Total income (loss) from discontinued operations, net of taxes	208.8	(665.4)	310.0
Net cash flows provided by operations	(14.6)	(4.3)	960.6
Net cash flows provided by (used in) investing activities	$ 10,925.3	$ (567.4)	$ (721.7)