Note 6. Railcar Leasing and Management Services Group Selected Leasing Income Statement Information (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		$ 591.2	$ 496.6	$ 416.8	$ 472.7	$ 472.2	$ 419.8	$ 293.3	$ 330.7	$ 1,977.3		$ 1,516.0		$ 1,749.7
Total operating profit (loss)		113.5	92.7	73.0	54.8	69.2	78.3	57.8	51.5	334.0		256.8		(154.6)
Depreciation and amortization										276.4		265.7		258.5
Selling, engineering, and administrative expenses:		$ 47.7	$ 48.0	$ 45.0	$ 44.7	$ 42.9	$ 45.8	$ 46.2	$ 44.7	185.4		179.6		189.6
Profit recognized at sales-type lease commencement (1)										1.3	[1]	0.0		0.0
Loss on extinguishment of debt										1.5		11.7		5.0
Sustainable Railcar Conversions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation										12.1
Small Cube Covered Hoppers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation												7.0		7.0
Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating profit (loss)										423.3		350.9		353.7
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating profit (loss)										482.4		355.6		390.0
Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues										$ 770.6		$ 735.3		802.3
Revenues, Percent Change										4.80%		(8.40%)
Total operating profit (loss)	[2]									$ 423.3		$ 350.9		$ 353.7
Operating Income (Loss), Percent Change										20.60%		(0.80%)
Operating Profit Margin										54.90%		47.70%		44.10%
Depreciation and amortization	[2]									$ 236.4	[3]	$ 226.0	[3],[4]	$ 214.7	[4]
Depreciation, Depletion, and Amortization, Percent Change	[2],[3]									4.60%		5.30%	[4]
Cost, Maintenance	[2]									$ 113.4		$ 95.0		88.1
Maintenance Costs, Percent Change	[2]									19.40%		7.80%
Payments for Rent	[2]									$ 19.3		$ 18.4		21.1
Operating Leases, Rent Expense and Ad Valorem Taxes, Percent Change	[2]									4.90%		(12.80%)
Selling, engineering, and administrative expenses:	[2]									$ 54.0		$ 50.6		51.3
Selling, Engineering, and Administrative Expense, Percent Change	[2]									6.70%		(1.40%)
Interest Expense	[5]									$ 186.7		$ 181.6		196.2
Interest Expense, Percent Change										2.80%		(7.40%)
Leasing and management [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues										$ 770.6		$ 735.3		747.9
Revenues, Percent Change										4.80%		(1.70%)
Total operating profit (loss)										$ 295.8		$ 296.8		$ 336.0
Operating Income (Loss), Percent Change										(0.30%)		(11.70%)
Leasing and management [Member] | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Profit Margin										38.40%		40.40%		44.90%
Railcar Owned One Year or Less [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues										$ 0.0	[6]	$ 0.0	[6]	$ 54.4
Sales of Leased Railcars [Domain] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating profit (loss)										$ 127.5		$ 54.1		$ 17.7
Operating Profit Margin										16.80%		11.70%		9.20%

[1] Included in gains on dispositions of property – lease portfolio sales on our Consolidated Statements of Operations.

[2] Operating profit includes: depreciation; fleet operating costs, which include maintenance, compliance, freight, and storage; rent and ad valorem taxes; and selling, engineering, and administrative expenses. Amortization of deferred profit on railcars sold from the Rail Products Group to the Leasing Group is included in the operating profits of the Leasing Group, resulting in the recognition of depreciation expense based on our original manufacturing cost of the railcars. Interest expense is not a component of operating profit and includes the effect of hedges.

[3] Depreciation expense includes $12.1 million and $8.8 million for the years ended December 31, 2022 and 2021, respectively, related to the disposal of certain railcar components associated with our sustainable railcar conversion program.

[4] Additionally, depreciation expense related to our small cube covered hopper railcars decreased by approximately $7.0 million for the years ended December 31, 2021 and 2020 as a result of the impairment charge recorded in the second quarter of 2020 related to these railcars.

[5] Interest expense for the year ended December 31, 2022 includes $1.5 million of loss on extinguishment of debt associated with the repayment of TRIP Railcar Co.'s outstanding term loan agreement. See Note 8 for more information. Interest expense for the year ended December 31, 2021 includes $11.7 million of loss on extinguishment of debt associated with the refinancing of our partially-owned subsidiaries' debt. Interest expense for the year ended December 31, 2020 includes $5.0 million of loss on extinguishment of debt associated with the early redemption of debt.

[6] Beginning in the fourth quarter of 2020, we made a prospective change in the presentation of sales of railcars from the lease fleet. Therefore, all railcar sales for the years ended December 31, 2022 and 2021 are presented as a net gain or loss from the disposal of a long-term asset regardless of the age of railcar that is sold. See Note 1 for more information.