Note 1. Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract Receivable	$ 4.4	$ 5.2
Railcar Leasing and Management Services Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 87.3
Revenue, remaining performance obligation expected to be delivered in current year	21.10%
Rail Products Group [Member] | Railcar products [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1,014.5
Revenue, remaining performance obligation expected to be delivered in current year	61.00%
Rail Products Group [Member] | Railcar products [Domain] | External Customers [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 669.0
Rail Products Group [Member] | Railcar products [Domain] | Leasing [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	345.5
Rail Products Group [Member] | Components and maintenance services [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 8.2
Revenue, remaining performance obligation expected to be delivered in current year	100.00%