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Property, Plant, and Equipment - Components of property, plant, and equipment (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | $ 9,482.4 | $ 9,272.6
Less: accumulated depreciation | (2,491.2) | (2,385.8)
Property, Plant and Equipment, Net | 6,991.2 | 6,886.8
Intersegment Eliminations [Member] |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | (1,063.5) | (1,050.7)
Property, Plant and Equipment, Net | (758.7) | (763.3)
Negative Accumulated Depreciation PP&E- Deferred Profit | 304.8 | 287.4
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, Plant and Equipment, Net | 7,406.4 | 7,309.4
Manufacturing and Corporate [Member] |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | 793.5 | 823.9
Less: accumulated depreciation | (450.0) | (483.2)
Property, Plant and Equipment, Net | 343.5 | 340.7
Manufacturing and Corporate [Member] | Land |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | 16.2 | 15.7
Manufacturing and Corporate [Member] | Buildings and improvements |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | 374.8 | 384.6
Manufacturing and Corporate [Member] | Machinery and other |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | 388.6 | 405.5
Manufacturing and Corporate [Member] | Construction in progress |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | 13.9 | 18.1
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | 7,510.1 | 7,269.0
Less: accumulated depreciation | (1,594.4) | (1,480.9)
Property, Plant and Equipment, Net | 5,915.7 | 5,788.1
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Machinery and other | Operating Segments [Member] |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | 25.9 | 21.7
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Equipment on lease | Operating Segments [Member] |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | 7,484.2 | 7,247.3
Partially-owned subsidiaries |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | 1,927.9 | 1,917.6
Less: accumulated depreciation | (635.0) | (599.0)
Partially-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] |  |
Property, Plant and Equipment, Net [Abstract] |  |
Less: accumulated depreciation | (751.6) | (709.1)
Property, Plant and Equipment, Net | 1,490.7 | 1,521.3
Partially-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Equipment on lease | Operating Segments [Member] |  |
Property, Plant and Equipment, Net [Abstract] |  |
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.9 and $1,917.6 | $ 2,242.3 | $ 2,230.4

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