Discontinued Operations (Schedule Of Condensed Statements Of Income And Cash Flow Of Aerospace Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for income taxes		$ 106.4	$ 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
Discontinued Operations, Disposed of by Sale | Aerospace
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income		29.3	72.8	70.2
Interest expense		99.6	369.3	366.5
Provision for credit losses		0.0	15.6	1.8
Rental income on operating leases		312.5	1,236.8	1,134.4
Other income		9.0	22.5	56.5
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		(39.6)	(101.9)	(68.2)
Loss on debt extinguishment	$ 39.0	39.0	8.3	1.1
Income from discontinued operations before provision for income taxes		168.4	459.3	366.3
Provision for income taxes		70.5	914.6	45.9
Gain on sale of discontinued operations, net of taxes		118.6	0.0	0.0
Total income (loss) from discontinued operations, net of taxes		216.5	(455.3)	320.4
Impairment charge			$ 32.0	$ 4.0
Suspended depreciation		106.0
Repayments on borrowings	$ 1,000.0
Tax expense		$ (847.0)
Tax rate for discontinued operations		42.00%	199.00%	12.00%
Net cash flows provided by operations		$ 32.4	$ 35.7	$ 942.1
Net cash flows provided by (used in) investing activities		$ 10,812.7	$ (655.9)	$ (749.6)