Financial Data of Busines Segments (Details)			3 Months Ended	12 Months Ended
	Dec. 29, 2020 USD ($)	Dec. 29, 2020 EUR (€)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) AircraftEngines	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Lease Income				$ 1,140,500,000	$ 1,087,500,000	$ 1,088,500,000
MarineOperatingRevenue				19,100,000	15,600,000	8,200,000
Other Operating Income				97,800,000	106,100,000	105,400,000
Total Revenues				1,257,400,000	1,209,200,000	1,202,100,000
Maintenance Expense				297,100,000	315,500,000	314,400,000
Marine operating expense				17,500,000	19,700,000	18,900,000
Depreciation				364,400,000	330,500,000	321,300,000
Operating Lease, Expense				39,200,000	49,300,000	54,400,000
Other operating expense				44,000,000.0	35,300,000	31,300,000
Total Expenses				762,200,000	750,300,000	740,300,000
Net gain on asset dispositions				105,900,000	41,700,000	51,600,000
Interest Income (Expense), Net				(204,000,000.0)	(190,300,000)	(180,500,000)
Other (expense) income				(3,700,000)	(13,000,000.0)	(7,300,000)
Share of affiliates' earnings (pre-tax)				56,500,000	95,800,000	94,500,000
Segment Profit Loss				449,900,000	393,100,000	420,100,000
Selling, general and administrative				198,300,000	172,000,000.0	180,400,000
Income tax benefit				53,200,000	37,300,000	40,900,000
Income from continuing operations				143,100,000	150,200,000	180,800,000
Net Income				143,100,000	151,300,000	211,200,000
Disposition Gains on Owned Assets				82,400,000	39,400,000	58,600,000
Nonoperating Income, Residual Sharing Income				8,900,000	2,500,000	1,900,000
Asset Impairment Charges				(2,400,000)	(300,000)	(6,600,000)
Identifiable assets				9,541,700,000	8,937,600,000	7,994,000,000
Disposal Group, Including Discontinued Operation, Assets						291,100,000
Nonremarketing Disposition Gain (Loss)				17,000,000.0	100,000	(2,300,000)
Portfolio Investments and Capital Additions				1,131,900,000	1,064,000,000	722,800,000
Investments in Affiliated Companies				588,400,000	584,700,000	512,600,000
Assets of Continuing Operations				9,541,700,000	8,937,600,000	7,994,000,000
Payments to Acquire Property, Plant, and Equipment				(1,130,100,000)	(860,800,000)	(722,800,000)
Total Discontinued Operations, Net of Taxes				0	1,100,000	30,400,000
Trifleet Leasing Holding B.V.
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Payments to acquire business, gross	$ 203,200,000	€ 165,000,000
Parent [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income tax benefit				108,500,000	70,900,000	58,900,000
Other Business Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Lease Income				25,000,000.0	0	0
MarineOperatingRevenue				0	0	0
Other Operating Income				8,700,000	0	0
Total Revenues				33,700,000	0	0
Maintenance Expense				4,100,000	0	0
Marine operating expense				0	0	0
Depreciation				12,100,000	0	0
Operating Lease, Expense				0	0	0
Other operating expense				3,000,000.0	0	0
Total Expenses				19,200,000	0	0
Net gain on asset dispositions				900,000	0	0
Interest Income (Expense), Net				(6,000,000.0)	7,700,000	5,800,000
Other (expense) income				(10,700,000)	(3,100,000)	(3,200,000)
Share of affiliates' earnings (pre-tax)				0	0	0
Segment Profit Loss				(1,300,000)	4,600,000	2,600,000
Disposition Gains on Owned Assets				500,000	0	0
Nonoperating Income, Residual Sharing Income				0	0	0
Asset Impairment Charges				0	0	0
Identifiable assets						206,900,000
Disposal Group, Including Discontinued Operation, Assets						0
Nonremarketing Disposition Gain (Loss)				400,000	0	0
Portfolio Investments and Capital Additions				31,200,000	205,500,000	4,900,000
Investments in Affiliated Companies				0	0	0
Assets of Continuing Operations				621,400,000	541,300,000
Rail North America [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Lease Income				814,500,000	838,300,000	868,300,000
MarineOperatingRevenue				0	0	0
Other Operating Income				77,200,000	95,800,000	96,200,000
Total Revenues				891,700,000	934,100,000	964,500,000
Maintenance Expense				235,400,000	264,700,000	267,900,000
Marine operating expense				0	0	0
Depreciation				261,100,000	258,600,000	256,900,000
Operating Lease, Expense				39,200,000	49,300,000	54,400,000
Other operating expense				30,300,000	27,300,000	23,900,000
Total Expenses				566,000,000.0	599,900,000	603,100,000
Net gain on asset dispositions				94,300,000	38,300,000	54,600,000
Interest Income (Expense), Net				(136,200,000)	(139,900,000)	(134,500,000)
Other (expense) income				1,600,000	(4,900,000)	(5,300,000)
Share of affiliates' earnings (pre-tax)				0	(100,000)	0
Segment Profit Loss				285,400,000	227,600,000	276,200,000
Disposition Gains on Owned Assets				80,700,000	38,800,000	58,500,000
Nonoperating Income, Residual Sharing Income				900,000	400,000	400,000
Asset Impairment Charges				(2,400,000)	(300,000)	(400,000)
Identifiable assets						5,646,700,000
Disposal Group, Including Discontinued Operation, Assets						0
Nonremarketing Disposition Gain (Loss)				15,100,000	(600,000)	(3,900,000)
Portfolio Investments and Capital Additions				574,400,000	642,000,000.0	502,200,000
Investments in Affiliated Companies					0	200,000
Assets of Continuing Operations				6,141,700,000	5,944,400,000
Rail North America [Member] | Adler Funding Llc [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Investments in Affiliated Companies				300,000
Rail International [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Lease Income				272,900,000	248,400,000	219,200,000
MarineOperatingRevenue				0	0	0
Other Operating Income				11,400,000	9,700,000	8,500,000
Total Revenues				284,300,000	258,100,000	227,700,000
Maintenance Expense				57,600,000	50,800,000	46,500,000
Marine operating expense				0	0	0
Depreciation				73,600,000	66,600,000	57,800,000
Operating Lease, Expense				0	0	0
Other operating expense				9,000,000.0	7,500,000	6,800,000
Total Expenses				140,200,000	124,900,000	111,100,000
Net gain on asset dispositions				2,700,000	1,200,000	1,700,000
Interest Income (Expense), Net				(45,200,000)	(45,900,000)	(40,600,000)
Other (expense) income				3,400,000	(5,000,000.0)	1,200,000
Share of affiliates' earnings (pre-tax)				0	0	0
Segment Profit Loss				105,000,000.0	83,500,000	78,900,000
Disposition Gains on Owned Assets				1,200,000	500,000	100,000
Nonoperating Income, Residual Sharing Income				0	0	0
Asset Impairment Charges				0	0	0
Identifiable assets						1,486,700,000
Disposal Group, Including Discontinued Operation, Assets						0
Nonremarketing Disposition Gain (Loss)				1,500,000	700,000	1,600,000
Portfolio Investments and Capital Additions				173,300,000	216,000,000.0	215,700,000
Investments in Affiliated Companies				0	0	0
Assets of Continuing Operations				1,729,900,000	1,745,800,000
Portfolio Management [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Lease Income				28,100,000	800,000	1,000,000.0
MarineOperatingRevenue				19,100,000	15,600,000	8,200,000
Other Operating Income				500,000	600,000	700,000
Total Revenues				47,700,000	17,000,000.0	9,900,000
Maintenance Expense				0	0	0
Marine operating expense				17,500,000	19,700,000	18,900,000
Depreciation				17,600,000	5,300,000	6,600,000
Operating Lease, Expense				0	0	0
Other operating expense				1,700,000	500,000	600,000
Total Expenses				36,800,000	25,500,000	26,100,000
Net gain on asset dispositions				8,000,000.0	2,200,000	(4,700,000)
Interest Income (Expense), Net				(16,600,000)	(12,200,000)	(11,200,000)
Other (expense) income				2,000,000.0	0	0
Share of affiliates' earnings (pre-tax)				56,500,000	95,900,000	94,500,000
Segment Profit Loss				60,800,000	77,400,000	62,400,000
Disposition Gains on Owned Assets				0	100,000	0
Nonoperating Income, Residual Sharing Income				8,000,000.0	2,100,000	1,500,000
Asset Impairment Charges				0	0	(6,200,000)
Disposal Group, Including Discontinued Operation, Assets						0
Nonremarketing Disposition Gain (Loss)				0	0	0
Portfolio Investments and Capital Additions				353,000,000.0	500,000	0
Investments in Affiliated Companies					584,700,000	512,400,000
Assets of Continuing Operations				$ 1,048,700,000	706,100,000	$ 653,700,000
Number Of Aircraft Engines | AircraftEngines				14
Number of Specialized Gas Vessels | AircraftEngines				5
Portfolio Management [Member] | Rolls Royce Partners Finance [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Investments in Affiliated Companies				$ 588,100,000	$ 584,700,000
Portfolio Management [Member] | Rolls-Royce Aircraft Engines [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Payments to Acquire Property, Plant, and Equipment			$ 352,000,000