Note 6. Railcar Leasing and Management Services Group Selected Leasing Balance Sheet Information (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents		$ 105.7	$ 79.6
Accounts receivable		363.5	323.5
Property, plant, and equipment, net		7,004.8	6,886.8
Restricted cash		129.4	214.7
Other assets		392.1	386.6
Total assets		8,906.5	8,724.3
Debt, Long-Term and Short-Term, Combined Amount		5,754.2	5,607.6
Deferred income taxes		1,103.5	1,134.7
Other liabilities		165.7	163.9
Total liabilities		7,631.0	7,454.7
Noncontrolling interest		238.4	257.2
Total Equity		1,037.1	1,012.4
Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents		6.7	2.6
Accounts receivable		157.7	100.7
Property, plant, and equipment, net		7,413.9	7,309.4
Restricted cash		129.4	214.7
Other assets		188.0	152.5
Total assets		7,895.7	7,779.9
Accounts payable and accrued liabilities		164.9	153.8
Debt, Long-Term and Short-Term, Combined Amount		4,959.6	4,983.5
Deferred income taxes		1,131.3	1,153.4
Other liabilities		40.2	38.8
Total liabilities		6,296.0	6,329.5
Noncontrolling interest		236.3	257.2
Total Equity		1,363.4	1,193.2
Intersegment Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Property, plant, and equipment, net		(750.2)	(763.3)
Wholly Owned Subsidiaries [Member] | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents		6.7	2.6
Accounts receivable		141.8	89.9
Property, plant, and equipment, net		5,940.7	5,788.1
Restricted cash		98.8	140.3
Other assets		186.2	150.3
Total assets		6,374.2	6,171.2
Accounts payable and accrued liabilities		131.8	109.7
Debt, Long-Term and Short-Term, Combined Amount		3,819.2	3,800.7
Deferred income taxes		1,130.2	1,152.3
Other liabilities		40.2	38.8
Total liabilities		5,121.4	5,101.5
Noncontrolling interest		0.0	0.0
Total Equity		1,252.8	1,069.7
Partially-Owned Subsidiaries [Member] | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents		0.0	0.0
Accounts receivable		15.9	10.8
Property, plant, and equipment, net		1,473.2	1,521.3
Restricted cash		30.6	74.4
Other assets		1.8	2.2
Total assets		1,521.5	1,608.7
Accounts payable and accrued liabilities		33.1	44.1
Debt, Long-Term and Short-Term, Combined Amount		1,140.4	1,182.8
Deferred income taxes		1.1	1.1
Other liabilities		0.0	0.0
Total liabilities		1,174.6	1,228.0
Noncontrolling interest		236.3	257.2
Total Equity		110.6	123.5
Consolidated Subsidiaries, Leasing [Member] | Intersegment Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents		0.0	0.0
Accounts receivable			0.0
Property, plant, and equipment, net	[1]	(750.2)	(763.3)
Restricted cash		0.0	0.0
Other assets		0.0	0.0
Total assets	[1]	(750.2)	(763.3)
Accounts payable and accrued liabilities		0.0	0.0
Debt, Long-Term and Short-Term, Combined Amount		0.0	0.0
Deferred income taxes	[1]	(171.9)	(173.1)
Other liabilities		0.0	0.0
Total liabilities	[1]	(171.9)	(173.1)
Noncontrolling interest		0.0	0.0
Total Equity	[1]	(578.3)	(590.2)
Railcar Leasing and Management Services Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents		6.7	2.6
Accounts receivable		157.7	100.7
Property, plant, and equipment, net		6,663.7	6,546.1
Restricted cash		129.4	214.7
Other assets		188.0	152.5
Total assets		7,145.5	7,016.6
Accounts payable and accrued liabilities		164.9	153.8
Debt, Long-Term and Short-Term, Combined Amount		4,959.6	4,983.5
Deferred income taxes		959.4	980.3
Other liabilities		40.2	38.8
Total liabilities		6,124.1	6,156.4
Noncontrolling interest		236.3	257.2
Total Equity		$ 785.1	$ 603.0

[1] Net deferred profit on railcars sold to the Leasing Group consists of intersegment profit that is eliminated in consolidation. Net deferred profit and the related deferred tax impact are included as adjustments to the property, plant, and equipment, net and deferred income taxes line items, respectively, in the Eliminations – Lease Subsidiary column above to reflect the net book value of the railcars purchased by the Leasing Group from the Rail Products Group based on manufacturing cost. See Note 5 and Note 9 for a further discussion regarding our investment in our partially-owned leasing subsidiaries and the related indebtedness.