Note 7. Property, Plant, and Equipment Property, Plant, and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	$ 9,105.6	$ 9,087.2
Less accumulated depreciation, including partially-owned subsidiaries of $568.4 and $525.7	2,258.7	2,118.4
Property, Plant and Equipment, Net	6,846.9	6,968.8
Manufacturing Facility, Non-Operating [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	6.3
Intersegment Eliminations [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	(1,047.3)	(1,064.7)
NegativeAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	268.2	244.4
Property, Plant and Equipment, Net	(779.1)	(820.3)
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	7,276.7	7,422.2	[1]
Manufacturing and Corporate [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	828.0	873.6
Less accumulated depreciation, including partially-owned subsidiaries of $568.4 and $525.7	478.7	506.7
Property, Plant and Equipment, Net	349.3	366.9
Manufacturing and Corporate [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	17.4	19.6
Manufacturing and Corporate [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	377.4	393.3
Manufacturing and Corporate [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	415.1	418.8
Manufacturing and Corporate [Member] | Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	18.1	41.9
Wholly Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group [Member] | Operating Segments [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	7,082.0	7,030.1
Less accumulated depreciation, including partially-owned subsidiaries of $568.4 and $525.7	1,375.9	1,234.2
Property, Plant and Equipment, Net	5,706.1	5,795.9	[1]
Wholly Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	20.7	19.5
Wholly Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] | Railcars on Lease [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	7,061.3	7,010.6
Partially-Owned Subsidiaries [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	1,927.7	1,931.6
Less accumulated depreciation, including partially-owned subsidiaries of $568.4 and $525.7	568.4	525.7
Partially-Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group [Member] | Operating Segments [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	1,570.6	1,626.3	[1]
Partially-Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] | Railcars on Lease [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,927.7 and $1,931.6	2,242.9	2,248.2
Less accumulated depreciation, including partially-owned subsidiaries of $568.4 and $525.7	$ 672.3	$ 621.9

[1] See Note 11 for further information regarding impairment of long-lived assets recorded in the year ended December 31, 2020.