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Note 5. Partially Owned Leasing Subsidiaries (Details) | 3 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) board_member | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) board_member subsidiary | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) board_member | Aug. 18, 2021
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gains on dispositions of property: | $ 60,200,000 | $ 39,400,000 | $ 27,800,000 | $ 25,300,000 | $ 13,000,000.0 | $ 41,600,000 | $ 12,100,000 | $ 11,500,000 | $ 152,700,000 | $ 78,200,000 | $ 20,000,000.0 |  |
Revenues | $ 591,200,000 | $ 496,600,000 | $ 416,800,000 | $ 472,700,000 | $ 472,200,000 | $ 419,800,000 | $ 293,300,000 | $ 330,700,000 | $ 1,977,300,000 | $ 1,516,000,000 | $ 1,749,700,000 |  |
Signal Rail Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, JV Majority Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 90.00%
Equity Method Investment, Ownership Percentage | 12.90% |  |  |  |  |  |  |  | 12.90% |  |  | 12.90% | 10.00%
Proceeds from Equity Method Investment, Distribution |  |  |  |  |  |  |  |  | $ 13,500,000 |  |  |  |
Equity Method Investments | $ 20,200,000 |  |  |  |  |  |  |  | 20,200,000 |  |  | $ 20,200,000 |
Signal Rail Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Aggregate Future Estimated Investment of Railcars | 1,000,000,000 |  |  |  |  |  |  |  | 1,000,000,000 |  |  | 1,000,000,000 |
Proceeds from Sales of Business, Affiliate and Productive Assets |  |  |  |  |  |  |  |  | 254,100,000 |  |  | 579,200,000 |
Gains on dispositions of property: |  |  |  |  |  |  |  |  | 25,100,000 |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |
Partially-Owned Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company Guarantees | 0 |  |  |  |  |  |  |  | 0 |  |  | 0 |
Railcar Leasing and Management Services Group [Member] | Partially-Owned Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary | $ 136,100,000 |  |  |  |  |  |  |  | $ 136,100,000 |  |  | $ 136,100,000 |
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% |
Railcar Leasing and Management Services Group [Member] | Partially-Owned Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |

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