Note 6. Railcar Leasing and Management Services Group Operating Leases (Details) - Railcar Leasing and Management Services Group [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Lessor, Lease, Description [Line Items]
Operating Leases, Future Minimum Payments Receivable, Current	$ 568.1
Operating Leases, Future Minimum Payments Receivable, in Two Years	451.9
Operating Leases, Future Minimum Payments Receivable, in Three Years	347.1
Operating Leases, Future Minimum Payments Receivable, in Four Years	243.7
Operating Leases, Future Minimum Payments Receivable, in Five Years	154.0
Operating Leases, Future Minimum Payments Receivable, Thereafter	268.3
Operating Leases, Future Minimum Payments Receivable	2,033.1
Railroad Transportation Equipment [Member]
Lessor, Lease, Description [Line Items]
Operating Leases, Future Minimum Payments Receivable, Current	560.0
Operating Leases, Future Minimum Payments Receivable, in Two Years	445.8
Operating Leases, Future Minimum Payments Receivable, in Three Years	342.6
Operating Leases, Future Minimum Payments Receivable, in Four Years	241.5
Operating Leases, Future Minimum Payments Receivable, in Five Years	153.5
Operating Leases, Future Minimum Payments Receivable, Thereafter	268.0
Operating Leases, Future Minimum Payments Receivable	$ 2,011.4
Minimum [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Maximum [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract	10 years	20 years