Note 6. Railcar Leasing and Management Services Group Selected Leasing Income Statement Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		$ 2,983.3	$ 1,977.3		$ 1,516.0
Total operating profit		417.0	334.0		256.8
Depreciation and amortization		293.2	276.4		265.7
Selling, engineering, and administrative expenses:		201.9	185.4		179.6
Profit recognized at sales-type lease commencement (1)	[1]	0.0	1.3		0.0
Loss on extinguishment of debt		0.0	1.5		11.7
Sustainable Railcar Conversions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation		5.6	12.1		8.8
Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating profit		428.5	423.3		350.9
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating profit		557.9	482.4		355.6
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		870.9	770.6		735.3
Total operating profit	[2]	$ 428.5	$ 423.3		$ 350.9
Operating Income (Loss), Percent Change	[2]	1.20%	20.60%
Operating Profit Margin		49.20%	54.90%		47.70%
Depreciation and amortization	[3]	$ 244.6	$ 236.4		$ 226.0
Depreciation, Depletion, and Amortization, Percent Change	[3]	3.50%	4.60%
Cost, Maintenance		$ 138.9	$ 113.4		95.0
Maintenance Costs, Percent Change		22.50%	19.40%
Payments for Rent		$ 15.9	$ 19.3		18.4
Operating Leases, Rent Expense and Ad Valorem Taxes, Percent Change		(17.60%)	4.90%
Selling, engineering, and administrative expenses:		$ 56.6	$ 54.0		50.6
Selling, Engineering, and Administrative Expense, Percent Change		4.80%	6.70%
Interest Expense	[4]	$ 227.2	$ 186.7		181.6
Interest Expense, Percent Change	[4]	21.70%	2.80%
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		$ 870.9	$ 770.6		735.3
Revenues, Percent Change		13.00%	4.80%
Total operating profit	[2]	$ 345.7	$ 295.8		$ 296.8
Operating Income (Loss), Percent Change	[2]	16.90%	(0.30%)
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		39.70%	38.40%		40.40%
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		$ 82.8	$ 127.5	[5]	$ 54.1
Operating Profit Margin		21.70%	16.80%		11.70%

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

[2] Operating profit includes: depreciation and amortization; 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 and amortization expense includes $5.6 million, $12.1 million, and $8.8 million for the years ended December 31, 2023, 2022, and 2021, respectively, related to the disposal of certain railcar components associated with our sustainable railcar conversion program.

[4] 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. LLC's outstanding term loan agreement. 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.

[5] Includes $1.3 million selling profit associated with sales-type leases for the year ended December 31, 2022.