Railcar Leasing and Management Services Group - Selected consolidating financial information for the Leasing Group (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Cash and cash equivalents		$ 58.5	$ 167.3
Receivables, net of allowance		280.2	227.6
Property, Plant and Equipment, Net		6,893.8	6,846.9
Restricted cash		180.2	135.1
Other assets		329.4	266.5
Total assets		8,599.1	8,235.9
Total debt		5,493.7	5,170.6
Deferred income taxes		1,128.5	1,106.8
Other liabilities		140.3	147.9
Total liabilities		7,338.0	6,939.1
Noncontrolling interest		255.2	267.0
Total Equity		1,005.9	1,029.8
Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		4.4	3.4
Receivables, net of allowance		109.6	100.8
Property, Plant and Equipment, Net		7,326.6	7,276.7
Restricted cash		180.2	135.1
Other assets		134.5	69.4
Total assets		7,755.3	7,585.4
Accounts payable and accrued liabilities		157.8	143.5
Total debt		5,034.7	4,771.9
Deferred income taxes		1,147.9	1,115.3
Other liabilities		41.7	35.6
Total liabilities		6,382.1	6,066.3
Noncontrolling interest		255.2	267.0
Total Equity		1,118.0	1,252.1
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net		(774.4)	(779.1)
Railcar Leasing and Management Services Group [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		4.4	3.4
Receivables, net of allowance		109.6	100.8
Property, Plant and Equipment, Net		6,552.2	6,497.6
Restricted cash		180.2	135.1
Other assets		134.5	69.4
Total assets		6,980.9	6,806.3
Accounts payable and accrued liabilities		157.8	143.5
Total debt		5,034.7	4,771.9
Deferred income taxes		970.3	938.7
Other liabilities		41.7	35.6
Total liabilities		6,204.5	5,889.7
Noncontrolling interest		255.2	267.0
Total Equity		521.2	649.6
Wholly-owned subsidiaries | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		4.4	3.4
Receivables, net of allowance		97.3	90.7
Property, Plant and Equipment, Net		5,793.1	5,706.1
Restricted cash		117.1	76.5
Other assets		132.6	67.3
Total assets		6,144.5	5,944.0
Accounts payable and accrued liabilities		114.9	113.4
Total debt		3,844.5	3,555.8
Deferred income taxes		1,147.0	1,114.2
Other liabilities		41.7	35.6
Total liabilities		5,148.1	4,819.0
Noncontrolling interest		0.0	0.0
Total Equity		996.4	1,125.0
Partially-owned subsidiaries | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		0.0	0.0
Receivables, net of allowance		12.3	10.1
Property, Plant and Equipment, Net		1,533.5	1,570.6
Restricted cash		63.1	58.6
Other assets		1.9	2.1
Total assets		1,610.8	1,641.4
Accounts payable and accrued liabilities		42.9	30.1
Total debt		1,190.2	1,216.1
Deferred income taxes		0.9	1.1
Other liabilities		0.0	0.0
Total liabilities		1,234.0	1,247.3
Noncontrolling interest		255.2	267.0
Total Equity		121.6	127.1
Consolidated Subsidiaries, Leasing [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		0.0	0.0
Receivables, net of allowance		0.0	0.0
Property, Plant and Equipment, Net	[1]	(774.4)	(779.1)
Restricted cash		0.0	0.0
Other assets		0.0	0.0
Total assets	[1]	(774.4)	(779.1)
Accounts payable and accrued liabilities		0.0	0.0
Total debt		0.0	0.0
Deferred income taxes	[1]	(177.6)	(176.6)
Other liabilities		0.0	0.0
Total liabilities	[1]	(177.6)	(176.6)
Noncontrolling interest		0.0	0.0
Total Equity	[1]	$ (596.8)	$ (602.5)

[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 8 for a further discussion regarding our investment in our partially-owned leasing subsidiaries and the related indebtedness.