Note 6. Railcar Leasing and Management Services Group Leasing Debt (Details) - Railcar Leasing and Management Services Group [Member] $ in Millions	Dec. 31, 2023 USD ($)
Wholly Owned Subsidiaries [Member]
Lessor, Lease, Description [Line Items]
Net Book Value of Unpledged Equipment	$ 374.2
Wholly Owned Subsidiaries [Member] | Secured Debt [Member]
Lessor, Lease, Description [Line Items]
Debt Instrument, Collateral Amount	5,553.4
TRIP Holdings | Secured Debt [Member]
Lessor, Lease, Description [Line Items]
Debt Instrument, Collateral Amount	1,044.9
RIV 2013 Holdings | Secured Debt [Member] | TRP 2021 Secured Railcar Equipment Notes - RIV 2013 [Member]
Lessor, Lease, Description [Line Items]
Debt Instrument, Collateral Amount	$ 428.3