Note 6. Railcar Leasing and Management Services Group Leasing Debt (Details) - Railcar Leasing and Management Services Group [Member] $ in Millions	Dec. 31, 2020 USD ($)
Wholly Owned Subsidiaries [Member]
Lessor, Lease, Description [Line Items]
Net Book Value of Unpledged Equipment	$ 1,364.4
Wholly Owned Subsidiaries [Member] | Secured Debt [Member]
Lessor, Lease, Description [Line Items]
Debt Instrument, Collateral Amount	4,418.5
Partially-Owned Subsidiaries [Member] | Secured Debt [Member] | TRIP Master Funding Secured Railcar Equipment Notes [Member]
Lessor, Lease, Description [Line Items]
Debt Instrument, Collateral Amount	1,149.9
Partially-Owned Subsidiaries [Member] | Secured Debt [Member] | TRL 2012 Secured Railcar Equipment Notes - RIV 2013 [Member]
Lessor, Lease, Description [Line Items]
Debt Instrument, Collateral Amount	$ 476.4