Note 5. Partially Owned Leasing Subsidiaries (Details)	12 Months Ended	30 Months Ended
Dec. 31, 2023 USD ($) board_member subsidiary	Dec. 31, 2023 USD ($) board_member
Signal Rail Holdings LLC
Noncontrolling Interest [Line Items]
Equity Method Investment, JV Majority Ownership Percentage	87.10%	87.10%
Equity Method Investment, Ownership Percentage	12.90%	12.90%
Proceeds from Sales of Business, Affiliate and Productive Assets		$ 598,600,000
Equity Method Investments	$ 20,200,000	20,200,000
Partially-Owned Subsidiaries [Member] \| Partially-Owned Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary	$ 126,200,000	$ 126,200,000
Railcar Leasing and Management Services Group [Member] \| Partially-Owned Subsidiaries [Member] \| Partially-Owned Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Number of Subsidiaries \| subsidiary	2
Number of Board Members \| board_member	7	7
Number of Board Members of Subsidiary, Designated by Parent \| board_member	2	2
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary	$ 124,000,000	$ 124,000,000
Noncontrolling Interest, Ownership Percentage by Parent	38.00%	38.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	62.00%	62.00%
Parent Company Guarantees	$ 0	$ 0
Rail Products Group [Member] \| Partially-Owned Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary	$ 2,200,000	$ 2,200,000
Noncontrolling Interest, Ownership Percentage by Parent	51.00%	51.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	49.00%	49.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

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