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Partially-Owned Subsidiaries - Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($) board_member subsidiary
Signal Rail Holdings LLC |
Noncontrolling Interest [Line Items] |
Equity Method Investment, JV Majority Ownership Percentage | 87.40%
Equity Method Investment, Ownership Percentage | 12.60%
Equity Method Investments | $ 20.1
Partially-owned subsidiaries |
Noncontrolling Interest [Line Items] |
Parent Company Guarantees | $ 0.0
Leasing & Services | Partially-owned subsidiaries |
Noncontrolling Interest [Line Items] |
Number of Subsidiaries | subsidiary | 2
Number of Board Members | board_member | 7
Number of Board Members of Subsidiary, Designated by Parent | board_member | 2
Partially-owned subsidiaries | Rail Products Group [Member] |
Noncontrolling Interest [Line Items] |
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary | $ 2.7
Noncontrolling Interest, Ownership Percentage by Parent | 51.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 49.00%
TRIP Holdings & RIV 2013 | Leasing & Services |
Noncontrolling Interest [Line Items] |
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary | $ 131.4
TRIP Holdings [Member] | Leasing & Services |
Noncontrolling Interest [Line Items] |
Noncontrolling Interest, Ownership Percentage by Parent | 42.60%
RIV 2013 Holdings | Leasing & Services |
Noncontrolling Interest [Line Items] |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 30.50%

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