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Number of subsidiaries.

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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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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		9 Months Ended		39 Months Ended
	Sep. 30, 2024 USD ($) board_member	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) subsidiary board_member	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) board_member
Noncontrolling Interest [Line Items]
Gains on dispositions of property	$ 13.4	$ 7.5	$ 40.4	$ 53.2
Revenues	$ 798.8	$ 821.3	2,449.8	$ 2,185.4
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	87.40%		87.40%		87.40%
Equity Method Investment, Ownership Percentage	12.60%		12.60%		12.60%
Proceeds from Sales of Business, Affiliate and Productive Assets			$ 142.8		$ 741.4
Equity Method Investments	$ 21.5		21.5		21.5
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 \| Rail Products Group [Member]
Noncontrolling Interest [Line Items]
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary	$ 2.8		$ 2.8		$ 2.8
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%
TRIP Holdings & RIV 2013 \| Leasing & Services
Noncontrolling Interest [Line Items]
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary	$ 125.3		$ 125.3		$ 125.3
TRIP Holdings [Member] \| Leasing & Services
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	42.60%		42.60%		42.60%
RIV 2013 Holdings \| Leasing & Services
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	30.50%		30.50%		30.50%