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Property, Plant, and Equipment - Components of property, plant, and equipment (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 |  | $ 9,658.2 | $ 9,539.6
Less: accumulated depreciation |  | (2,598.6) | (2,534.8)
Property, Plant and Equipment, Net |  | 7,059.6 | 7,004.8
Railcars on Lease [Member] |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, Plant and Equipment, Net |  | 6,717.5 | 6,654.8
Railcars on Lease [Member] | Intersegment Eliminations [Member] |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 | [1] | (1,061.7) | (1,061.3)
Property, Plant and Equipment, Net |  | (743.1) | (750.2)
Negative Accumulated Depreciation PP&E- Deferred Profit |  | 318.6 | 311.1
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 $1,921.7 and $1,922.5 |  | 7,657.7 | 7,536.7
Less: accumulated depreciation |  | (1,655.1) | (1,604.9)
Property, Plant and Equipment, Net |  | 6,002.6 | 5,931.8
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 $1,921.7 and $1,922.5 |  | 2,235.7 | 2,236.6
Less: accumulated depreciation |  | (777.7) | (763.4)
Property, Plant and Equipment, Net |  | 1,458.0 | 1,473.2
Operating & Administrative Assets [Member] |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 |  | 826.5 | 827.6
Less: accumulated depreciation |  | (484.4) | (477.6)
Property, Plant and Equipment, Net |  | 342.1 | 350.0
Operating & Administrative Assets [Member] | Land |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 |  | 16.4 | 16.1
Operating & Administrative Assets [Member] | Buildings and improvements |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 |  | 380.1 | 380.4
Operating & Administrative Assets [Member] | Machinery and other |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 |  | 421.8 | 419.8
Operating & Administrative Assets [Member] | Construction in progress |  |  |
Property, Plant and Equipment, Net [Abstract] |  |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 |  | $ 8.2 | $ 11.3
[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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