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Partially-Owned Leasing Subsidiaries - Narrative (Details) $ in Millions | 9 Months Ended | 27 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) subsidiary board_member | Sep. 30, 2023 USD ($) 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 |  | $ 598.6
Equity Method Investments | $ 20.7 | 20.7
Partially-owned subsidiaries |  |
Noncontrolling Interest [Line Items] |  |
Parent Company Guarantees | $ 0.0 | $ 0.0
Railcar Leasing and Management Services Group [Member] | Partially-owned subsidiaries |  |
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
Partially-owned subsidiaries | Railcar Leasing and Management Services Group [Member] |  |
Noncontrolling Interest [Line Items] |  |
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary | $ 132.8 | $ 132.8
Noncontrolling Interest, Ownership Percentage by Parent | 38.00% | 38.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 62.00% | 62.00%

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