Note 1. Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract Receivable	$ 5.2	$ 10.2
Railcar Leasing and Management Services Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 100.5
Revenue, remaining performance obligation expected to be delivered in current year	16.00%
Rail Group [Member] | Railcar products [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1,832.5
Revenue, remaining performance obligation expected to be delivered in current year	59.00%
Rail Group [Member] | Railcar products [Domain] | External Customers [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1,213.4
Rail Group [Member] | Railcar products [Domain] | Leasing [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	619.1
Rail Group [Member] | Components and maintenance services [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 44.8
Revenue, remaining performance obligation expected to be delivered in current year	100.00%