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Equity Method Investment, Joint Venture Majority Ownership Percentage

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Number of subsidiaries.

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Number of Board Members

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Parent Company Guarantees

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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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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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Partially-Owned Subsidiaries - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended		36 Months Ended
	Jun. 30, 2024 USD ($) board_member	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) board_member subsidiary	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) board_member
Noncontrolling Interest [Line Items]
Gains on dispositions of property	$ 24.2	$ 30.4	$ 27.0	$ 45.7
Revenues	841.4	$ 722.4	$ 1,651.0	$ 1,364.1
Signal Rail Holdings LLC
Noncontrolling Interest [Line Items]
Revenues	$ 1.4
Signal Rail Holdings LLC
Noncontrolling Interest [Line Items]
Equity Method Investment, JV Majority Ownership Percentage	87.30%		87.30%		87.30%
Equity Method Investment, Ownership Percentage	12.70%		12.70%		12.70%
Proceeds from Sales of Business, Affiliate and Productive Assets	$ 142.8				$ 741.4
Equity Method Investments	21.8		$ 21.8		21.8
Gains on dispositions of property	18.8
Proceeds from Equity Method Investment, Distribution	2.0
Partially-owned subsidiaries
Noncontrolling Interest [Line Items]
Parent Company Guarantees	$ 0.0		$ 0.0		$ 0.0
Leasing & Services \| Partially-owned subsidiaries
Noncontrolling Interest [Line Items]
Number of Subsidiaries \| subsidiary			2
Number of Board Members \| board_member	7		7		7
Number of Board Members of Subsidiary, Designated by Parent \| board_member	2		2		2
Partially-owned subsidiaries \| Leasing & Services
Noncontrolling Interest [Line Items]
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary	$ 123.9		$ 123.9		$ 123.9
Noncontrolling Interest, Ownership Percentage by Parent	38.00%		38.00%		38.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	62.00%		62.00%		62.00%
Partially-owned subsidiaries \| Rail Products Group [Member]
Noncontrolling Interest [Line Items]
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary	$ 2.6		$ 2.6		$ 2.6
Noncontrolling Interest, Ownership Percentage by Parent	51.00%		51.00%		51.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	49.00%		49.00%		49.00%