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Railcar Leasing and Services Group - Lease Portfolio Sales (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Property Subject to or Available for Operating Lease [Line Items]
Proceeds From Sale Of Property Subject To Or Available For Operating Lease				$ 142.9	$ 253.7
Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment		$ 21.7	$ 11.4	35.4	36.2
Operating Segments [Member] | Leasing & Services
Property Subject to or Available for Operating Lease [Line Items]
Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment	[1]	$ 21.7	$ 11.4	$ 35.4	$ 36.2
Operating Profit Margin		42.60%	39.80%	39.40%	40.10%
Operating Segments [Member] | Sales of Leased Railcars [Domain] | Leasing & Services
Property Subject to or Available for Operating Lease [Line Items]
Proceeds From Sale Of Property Subject To Or Available For Operating Lease		$ 79.9	$ 67.0	$ 142.9	$ 253.7
Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment		$ 21.7	$ 11.4	$ 35.4	$ 36.2
Operating Profit Margin		27.20%	17.00%	24.80%	14.30%
[1] Significant expense categories and amounts align with the segment-level information that is regularly provided to and reviewed by the CODM. Intersegment expenses are included within the amounts shown.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
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-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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