Railcar Leasing and Management Services Group - Selected consolidating income statement information for the Leasing Group (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022		Mar. 31, 2021
Revenues:
Revenues		$ 472.7		$ 330.7
Operating profit (1):
Total operating profit		54.8		51.5
Select expense information:
Depreciation (3)		66.9		64.6
Selling, engineering, and administrative expenses		44.7		44.7
Profit recognized at sales-type lease commencement (1)		1.3	[1]	0.0
Sustainable Railcar Conversions
Select expense information:
Depreciation (3)		2.2
Operating Segments [Member]
Revenues:
Revenues		472.7		330.7
Operating profit (1):
Total operating profit		80.6		69.5
Railcar Leasing and Management Services Group [Member]
Operating profit (1):
Total operating profit		79.8		78.3
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member]
Revenues:
Revenues		183.1		183.5
Operating profit (1):
Total operating profit		$ 79.8		$ 78.3
Operating Income (Loss), Percent Change		1.90%
Operating Profit Margin		43.60%		42.70%
Select expense information:
Depreciation (3)	[3]	$ 57.2	[2]	$ 54.6
Depreciation, Depletion, and Amortization, Percent Change	[3]	4.80%
Maintenance and compliance	[3]	$ 29.2		25.6
Maintenance Costs, Percent Change	[3]	14.10%
Operating lease expense	[3]	$ 5.0		4.6
Operating Leases, Rent Expense, Percent Change	[3]	8.70%
Selling, engineering, and administrative expenses	[3]	$ 12.8		11.3
Selling, Engineering, and Administrative Expense, Percent Change	[3]	13.30%
Interest		$ 38.7		45.7
Interest Expense, Percent Change		(15.30%)
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] | Leasing and Management [Member]
Revenues:
Revenues		$ 183.1		183.5
Revenues, Percent Change		(0.20%)
Operating profit (1):
Total operating profit		$ 68.0		$ 76.6
Operating Income (Loss), Percent Change		(11.20%)
Operating Profit Margin		37.10%		41.70%
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] | Sales of Leased Railcars [Domain]
Operating profit (1):
Total operating profit		$ 11.8	[4]	$ 1.7
Operating Profit Margin		14.80%		9.80%

[1] Included in gains on dispositions of property – lease portfolio sales on our Consolidated Statements of Operations.

[2] Depreciation expense increased $2.2 million for the three months ended March 31, 2022 as a result of the disposal of certain railcar components associated with our sustainable railcar conversion program.

[3] 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 profit 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.

[4] Includes $1.3 million selling profit associated with sales-type leases for the three months ended March 31, 2022.