Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income
Interest and fees on loans	$ 1,638.1	$ 1,779.6	$ 1,374.0
Other interest and dividends	197.5	131.9	71.2
Interest income	1,835.6	1,911.5	1,445.2
Interest expense
Interest on borrowings	344.4	358.4	401.3
Interest on deposits	373.3	394.8	330.1
Interest expense	717.7	753.2	731.4
Net interest revenue	1,117.9	1,158.3	713.8
Provision for credit losses	114.6	194.7	158.6
Net interest revenue, after credit provision	1,003.3	963.6	555.2
Non-interest income
Rental income on operating leases	1,007.4	1,031.6	1,018.1
Other non-interest income	364.2	150.6	149.6
Total non-interest income	1,371.6	1,182.2	1,167.7
Total revenue, net of interest expense and credit provision	2,374.9	2,145.8	1,722.9
Non-interest expenses
Depreciation on operating lease equipment	296.3	261.1	229.2
Maintenance and other operating lease expenses	222.9	213.6	185.1
Operating expenses	1,188.5	1,283.5	1,121.1
Goodwill impairment	255.6	354.2	0.0
Loss on debt extinguishment and deposit redemption	220.0	12.5	1.5
Total non-interest expenses	2,183.3	2,124.9	1,536.9
Income from continuing operations before (benefit) provision for income taxes	191.6	20.9	186.0
(Benefit) provision for income taxes	(67.8)	203.5	(538.0)
Income (loss) from continuing operations before attribution of noncontrolling interests	259.4	(182.6)	724.0
Loss attributable to noncontrolling interests, after tax	0.0	0.0	0.1
Income (loss) from continuing operations	259.4	(182.6)	724.1
Discontinued operations
Income (loss) from discontinued operations, net of taxes	90.2	(665.4)	310.0
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 income (loss)	468.2	(848.0)	1,034.1
Preferred dividends	9.8	0.0	0.0
Net income (loss) available to common shareholders	458.4	(848.0)	1,034.1
Income (loss) from continuing operations available to common shareholders	$ 249.6	$ (182.6)	$ 724.1
Basic income per common share
(Loss) income from continuing operations (in dollars per share)	$ 1.54	$ (0.90)	$ 3.90
(Loss) income from discontinued operations, net of taxes (in dollars per share)	1.28	(3.30)	1.67
(Loss) income from discontinued operations, net of taxes (in dollars per share)	2.82	(4.20)	5.57
Diluted income per common share
(Loss) income from continuing operations (in dollars per share)	1.52	(0.90)	3.89
(Loss) income from discontinued operations, net of taxes (in dollars per share)	1.28	(3.30)	1.66
Diluted (loss) income per common share (in dollars per share)	$ 2.80	$ (4.20)	$ 5.55
Average number of common shares — (thousands)
Basic (in shares)	162,290	201,850	185,500
Diluted (in shares)	163,950	201,850	186,388
Dividends declared per common share (in dollars per share)	$ 0.61	$ 0.60	$ 0.60