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Property, Plant, and Equipment - Components of property, plant, and equipment (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | $ 8,882.5 | $ 8,253.4
Less accumulated depreciation | (2,012.9) | (1,919.0)
Property, plant, and equipment, net | 6,869.6 | 6,334.4
Operating Segments |  |
Components of property, plant, and equipment |  |
Property, plant, and equipment, net | 7,731.5 | 7,162.1
Net deferred profit on railcars sold to the Leasing Group |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | (1,078.8) | (1,030.0)
Less accumulated amortization | 216.9 | 202.3
Property, plant, and equipment, net | (861.9) | (827.7)
Manufacturing/ Corporate |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 988.6 | 963.2
Less accumulated depreciation | (607.8) | (592.3)
Property, plant, and equipment, net | 380.8 | 370.9
Manufacturing/ Corporate | Land |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 25.5 | 24.2
Manufacturing/ Corporate | Buildings and improvements |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 388.1 | 385.5
Manufacturing/ Corporate | Machinery and other |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 529.9 | 537.2
Manufacturing/ Corporate | Construction in progress |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 45.1 | 16.3
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Operating Segments |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 6,582.0 | 5,948.3
Less accumulated depreciation | (1,031.9) | (971.8)
Property, plant, and equipment, net | 5,550.1 | 4,976.5
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Machinery and other | Operating Segments |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 13.8 | 13.5
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Equipment on lease | Operating Segments |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 6,568.2 | 5,934.8
Partially-owned subsidiaries |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 2,048.3 | 2,032.0
Less accumulated depreciation | (499.8) | (472.0)
Partially-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Operating Segments |  |
Components of property, plant, and equipment |  |
Property, plant, and equipment, net | 1,800.6 | 1,814.7
Partially-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Equipment on lease | Operating Segments |  |
Components of property, plant, and equipment |  |
Property, plant and equipment, at cost | 2,390.7 | 2,371.9
Less accumulated depreciation | $ (590.1) | $ (557.2)

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