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Summary of Significant Accounting Policies Revenue Recognition and Remaining performance obligation (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Rail Products Group [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Billed Contracts Receivable | $ 6.2 | $ 12.6
Rail Products Group [Member] | Rail Products [Domain] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 2,938.9 |
Revenue, remaining performance obligation expected to be delivered in current year | 49.10% |
Rail Products Group [Member] | Rail Products [Domain] | External Customers |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 2,626.3 |
Rail Products Group [Member] | Rail Products [Domain] | Leasing & Services |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | 312.6 |
Rail Products Group [Member] | Sustainable Railcar Conversions |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 35.8 |
Revenue, remaining performance obligation expected to be delivered in current year | 91.50% |
Leasing & Services |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Billed Contracts Receivable | $ 17.4 | $ 8.8
Leasing & Services | Leasing and Management [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 62.7 |
Revenue, remaining performance obligation expected to be delivered in current year | 21.40% |
Leasing & Services | Maintenance services |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 7.9 |
Revenue, remaining performance obligation expected to be delivered in current year | 100.00% |

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- Definition Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 912 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482312/912-310-45-2 + Details
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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 + Details
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