Note 6. Railcar Leasing and Management Services Group Selected Leasing Income Statement Information (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		$ 472.2	$ 419.8	$ 293.3	$ 330.7	$ 359.7	$ 396.8	$ 439.9	$ 553.3	$ 1,516.0		$ 1,749.7		$ 2,752.4
Total operating profit (loss)		69.2	78.3	57.8	51.5	30.4	64.0	(316.3)	67.3	256.8		(154.6)		396.8
Depreciation and amortization										265.7		258.5		276.5
Selling, engineering, and administrative expenses:		$ 42.9	$ 45.8	$ 46.2	$ 44.7	$ 47.5	$ 42.9	$ 48.6	$ 50.6	179.6		189.6		217.0
Sales-type Lease, Revenue										0.0		0.0		160.5
Loss on extinguishment of debt										11.7		5.0		0.0
Sustainable Railcar Conversions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation										8.8
Small Cube Covered Hoppers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation										7.0		7.0
Service Life [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization										30.8		30.8
Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues										735.3		802.3		1,117.2
Total operating profit (loss)										350.9		353.7		406.6
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating profit (loss)										355.6		390.0		684.2
Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues										$ 735.3		$ 802.3		1,117.2
Revenues, Percent Change										(8.40%)		(28.20%)
Total operating profit (loss)	[1]									$ 350.9		$ 353.7		$ 406.6
Operating Income (Loss), Percent Change										(0.80%)		(13.00%)
Operating Profit Margin										47.70%		44.10%		36.40%
Depreciation and amortization										$ 226.0	[2],[3],[4]	$ 214.7	[2],[3]	$ 232.2
Depreciation, Depletion, and Amortization, Percent Change										5.30%		(7.50%)
Cost, Maintenance										$ 95.0		$ 88.1		102.1
Maintenance Costs, Percent Change										7.80%		(13.70%)
Operating lease expense										$ 18.4		$ 21.1		28.5
Operating Leases, Rent Expense, Percent Change										(12.80%)		(26.00%)
Selling, engineering, and administrative expenses:										$ 50.6		$ 51.3		49.5
Selling, Engineering, and Administrative Expense, Percent Change										(1.40%)		3.60%
Interest Expense										$ 181.6	[5]	$ 196.2	[5]	197.2
Interest Expense, Percent Change										(7.40%)		(0.50%)
Leasing and management [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues										$ 735.3		$ 747.9		756.5
Total operating profit (loss)										$ 296.8		$ 336.0		$ 314.7
Leasing and management [Member] | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues, Percent Change										(1.70%)		(1.10%)
Operating Income (Loss), Percent Change										(11.70%)		6.80%
Operating Profit Margin										40.40%		44.90%		41.60%
Railcar Owned One Year or Less [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues										$ 0.0	[6]	$ 54.4		$ 360.7	[7]
Railcar Owned One Year or Less [Member] | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues, Percent Change												(84.90%)
Operating Income (Loss), Percent Change										205.60%		(80.70%)

[1] Operating profit includes: depreciation; fleet operating costs, which include maintenance, compliance, freight, and storage; rent and ad valorem taxes; and selling, engineering, and administrative expenses. Amortization of deferred profit on railcars sold from the Rail Products Group to the Leasing Group is included in the operating profits of the Leasing Group, resulting in the recognition of depreciation expense based on our original manufacturing cost of the railcars. Interest expense is not a component of operating profit and includes the effect of hedges.

[2] Additionally, depreciation expense related to our small cube covered hopper railcars decreased by approximately $7.0 million for the years ended December 31, 2021 and 2020 as a result of the impairment charge recorded in the second quarter of 2020 related to these railcars.

[3] Effective January 1, 2020, we revised the estimated useful lives and salvage values of certain railcar types in our lease fleet. This change in estimate resulted in a decrease in depreciation expense of approximately $30.8 million in the years ended December 31, 2021 and 2020. See Note 1 for further information.

[4] In connection with our sustainable railcar conversion program, depreciation expense increased $8.8 million for the year ended December 31, 2021, as a result of the disposal of certain railcar components.

[5] Interest expense for the year ended December 31, 2021 includes $11.7 million of loss on extinguishment of debt associated with the refinancing of our partially-owned subsidiaries' debt. See Note 8 for more information. Interest expense for the year ended December 31, 2020 includes $5.0 million of loss on extinguishment of debt associated with the early redemption of debt.

[6] Beginning in the fourth quarter of 2020, we made a prospective change in the presentation of sales of railcars from the lease fleet. Therefore, all railcar sales for the year ended December 31, 2021 are presented as a net gain or loss from the disposal of a long-term asset regardless of the age of railcar that is sold. See Note 1 for more information.

[7] Includes revenues associated with sales-type leases of $160.5 million for the year ended December 31, 2019.