Note 1. Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Rail Products Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Billed Contracts Receivable	$ 3.4	$ 12.6
Rail Products Group [Member] | New railcars [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 2,145.5
Revenue, remaining performance obligation expected to be delivered in current year	47.50%
Rail Products Group [Member] | New railcars [Domain] | External Customers [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1,895.2
Rail Products Group [Member] | New railcars [Domain] | Railcar Leasing and Services Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	250.3
Rail Products Group [Member] | Sustainable Railcar Conversions
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 3.1
Revenue, remaining performance obligation expected to be delivered in current year	100.00%
Railcar Leasing and Services Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Billed Contracts Receivable	$ 9.6	$ 8.8
Railcar Leasing and Services Group [Member] | Leasing and management [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 57.3
Revenue, remaining performance obligation expected to be delivered in current year	33.50%
Railcar Leasing and Services Group [Member] | Maintenance services [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 4.8
Revenue, remaining performance obligation expected to be delivered in current year	100.00%