Discontinued Operations (Schedule of Condensed Statements of Income and Cash Flow of Aerospace Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations, net of taxes	$ 107.2		$ 0.0	$ 119.9	$ 0.0
Total income (loss) from discontinued operations, net of taxes	115.5		(71.0)	217.2	14.0
Aerospace [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income	3.6			23.8
Interest expense	(1.4)			(97.3)
Provision for credit losses	0.0			0.0
Rental income on operating leases	2.0			308.7
Other Income	0.0			13.4
Depreciation on operating lease equipment	0.0			0.0
Maintenance and other operating lease expenses	0.0			(4.2)
Operating expenses	(13.7)			(38.6)
Loss on debt extinguishment	0.0			(39.0)
Income from discontinued operation before provision for income taxes	(9.5)			166.8
Provision for income taxes	7.4			(70.7)
Gain on sale of discontinued operations, net of taxes	107.2			119.9
Total income (loss) from discontinued operations, net of taxes	105.1			$ 216.0
Net cash flows used for operations	31.7
Net cash flows provided by (used in) investing activities	$ 10,730.2
Aerospace [Member] | Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income			15.8		31.8
Interest expense			(90.9)		(182.3)
Provision for credit losses			(4.8)		(14.7)
Rental income on operating leases			308.2		619.5
Other Income			4.5		20.5
Depreciation on operating lease equipment			(113.2)		(227.1)
Maintenance and other operating lease expenses			(14.3)		(21.6)
Operating expenses			(23.7)		(46.9)
Loss on debt extinguishment			(1.6)		(1.6)
Income from discontinued operation before provision for income taxes			80.0		177.6
Provision for income taxes			15.4		7.6
Gain on sale of discontinued operations, net of taxes			0.0		0.0
Total income (loss) from discontinued operations, net of taxes			95.4		$ 185.2
Repayment of secured borrowings		$ 1,000.0
Loss from extinguishment of secured borrowings		$ 39.0
Net cash flows used for operations			525.7
Net cash flows provided by (used in) investing activities			$ (296.1)