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Property, Plant, and Equipment - Components of property, plant, and equipment (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,928.5 and $1,920.5 |  | $ 10,124.4 | $ 9,751.1
Less: accumulated depreciation |  | (2,934.9) | (2,763.0)
Property, Plant and Equipment, Net |  | 7,189.5 | 6,988.1
Railcars on Lease [Member] |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, Plant and Equipment, Net |  | 6,832.4 | 6,631.6
Railcars on Lease [Member] | Intersegment Eliminations [Member] |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,928.5 and $1,920.5 | [1] | (1,084.8) | (1,069.8)
Property, Plant and Equipment, Net |  | (724.7) | (732.5)
Negative Accumulated Depreciation PP&E- Deferred Profit |  | 360.1 | 337.3
Wholly-owned subsidiaries | Railcars on Lease [Member] | Operating Segments [Member] |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,928.5 and $1,920.5 |  | 8,082.3 | 7,715.0
Less: accumulated depreciation |  | (1,905.3) | (1,766.9)
Property, Plant and Equipment, Net |  | 6,177.0 | 5,948.1
Partially-owned subsidiaries | Railcars on Lease [Member] | Operating Segments [Member] |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,928.5 and $1,920.5 |  | 2,240.8 | 2,233.1
Less: accumulated depreciation |  | (860.7) | (817.1)
Property, Plant and Equipment, Net |  | 1,380.1 | 1,416.0
Operating & Administrative Assets [Member] |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,928.5 and $1,920.5 |  | 886.1 | 872.8
Less: accumulated depreciation |  | (529.0) | (516.3)
Property, Plant and Equipment, Net |  | 357.1 | 356.5
Operating & Administrative Assets [Member] | Land |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,928.5 and $1,920.5 |  | 16.1 | 16.3
Operating & Administrative Assets [Member] | Buildings and improvements |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,928.5 and $1,920.5 |  | 406.3 | 403.2
Operating & Administrative Assets [Member] | Machinery and other |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,928.5 and $1,920.5 |  | 435.8 | 441.8
Operating & Administrative Assets [Member] | Construction in progress |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,928.5 and $1,920.5 |  | $ 27.9 | $ 11.5
[1] | Includes deferred profit related to new railcar additions, sustainable railcar conversions, railcar modifications, and other betterments. The deferred profit is subsequently eliminated in consolidation.

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