Railcar Leasing and Services Group - Narrative (Details) - Leasing & Services $ in Millions	Sep. 30, 2024 USD ($)
Minimum
Segment Reporting Information [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Maximum
Segment Reporting Information [Line Items]
Lessor, Operating Lease, Term of Contract	10 years
Wholly-owned subsidiaries
Segment Reporting Information [Line Items]
Net book value of unpledged equipment	$ 290.7
Wholly-owned subsidiaries | Secured Debt [Member]
Segment Reporting Information [Line Items]
Debt Instrument, Collateral Amount	5,587.4
TRIP Holdings [Member] | Secured Debt [Member]
Segment Reporting Information [Line Items]
Debt Instrument, Collateral Amount	1,018.9
RIV 2013 Holdings | Secured Debt [Member] | TRP 2021 Secured Railcar Equipment Notes - RIV 2013 [Member]
Segment Reporting Information [Line Items]
Debt Instrument, Collateral Amount	$ 413.1