Railcar Leasing and Services Group - Narrative (Details) - Leasing & Services $ in Millions	Mar. 31, 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	$ 368.6
Wholly-owned subsidiaries | Secured Debt [Member]
Segment Reporting Information [Line Items]
Debt Instrument, Collateral Amount	5,634.0
TRIP Holdings [Member] | Secured Debt [Member]
Segment Reporting Information [Line Items]
Debt Instrument, Collateral Amount	1,035.1
RIV 2013 Holdings | Secured Debt [Member] | TRP 2021 Secured Railcar Equipment Notes - RIV 2013 [Member]
Segment Reporting Information [Line Items]
Debt Instrument, Collateral Amount	$ 422.9