Note 6. Railcar Leasing and Management Services Group Other Operating Lease Obligations and Revenues (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Sale Leaseback Transaction [Line Items]
Payments to Acquire Equipment on Lease	$ 218.4
Railcars Acquired	6,779
Lessee, Operating Lease, Liability, Payments, Due	$ 52.1
Railcar Leasing and Management Services Group [Member]
Sale Leaseback Transaction [Line Items]
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months	9.8
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years	8.2
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years	7.5
Minimum Lease Payments, Sale Leaseback Transactions, within Four Years	5.5
Minimum Lease Payments, Sale Leaseback Transactions, within Five Years	2.3
Minimum Lease Payments, Sale Leaseback Transactions, Thereafter	0.9
Minimum Lease Payments, Sale Leaseback Transactions	34.2
Lessee, Operating Lease, Liability, Payments, Due	36.6
Other Third Parties [Member] | Railcar Leasing and Management Services Group [Member]
Sale Leaseback Transaction [Line Items]
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Next Twelve Months	8.1
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Two Years	6.1
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years	4.5
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Four Years	2.2
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Five Years	0.5
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Thereafter	0.3
Future Minimum Sublease Rentals, Sale Leaseback Transactions	21.7
Property Lease Guarantee [Member] | Railcar Leasing and Management Services Group [Member]
Sale Leaseback Transaction [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2.9
Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member] | Railroad Transportation Equipment Leased From Independent Owner Trusts [Member] | Railcar Leasing and Management Services Group [Member]
Sale Leaseback Transaction [Line Items]
Lessee, Operating Lease, Term of Contract	22 years
Building [Member] | Railcar Leasing and Management Services Group [Member]
Sale Leaseback Transaction [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 2.4