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Railcar Leasing and Services Group - Lease Portfolio Sales (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Proceeds From Sale Of Property Subject To Or Available For Operating Lease |  |  |  | $ 142.9 | $ 253.7
Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment |  | $ 21.7 | $ 11.4 | 35.4 | 36.2
Operating Segments [Member] | Leasing & Services |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment | [1] | $ 21.7 | $ 11.4 | $ 35.4 | $ 36.2
Operating Profit Margin |  | 42.60% | 39.80% | 39.40% | 40.10%
Operating Segments [Member] | Sales of Leased Railcars [Domain] | Leasing & Services |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Proceeds From Sale Of Property Subject To Or Available For Operating Lease |  | $ 79.9 | $ 67.0 | $ 142.9 | $ 253.7
Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment |  | $ 21.7 | $ 11.4 | $ 35.4 | $ 36.2
Operating Profit Margin |  | 27.20% | 17.00% | 24.80% | 14.30%
[1] | Significant expense categories and amounts align with the segment-level information that is regularly provided to and reviewed by the CODM. Intersegment expenses are included within the amounts shown.

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