Note 1. Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Sales-type Lease, Revenue		$ 0.0
Billed Contracts Receivable		$ 4.5	$ 2.9
Rail Products Group [Member] | Railcar products [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount			$ 3,903.0
Revenue, remaining performance obligation expected to be delivered in current year			48.50%
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	[1]		$ 3,444.1
Rail Products Group [Member] | Railcar products [Domain] | Leasing [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount			458.9
Rail Products Group [Member] | Sustainable Railcar Conversions
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount			$ 166.5
Revenue, remaining performance obligation expected to be delivered in current year			73.50%
Rail Products Group [Member] | Rail Products [Domain] | GATX
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount			$ 1,800.0
Railcar Leasing and Management Services Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount			$ 75.5
Revenue, remaining performance obligation expected to be delivered in current year			20.40%

[1] Unsatisfied performance obligations at December 31, 2022 include 15,000 railcars expected to be delivered through 2028, valued at approximately $1.8 billion, associated with a new long-term railcar supply agreement with GATX Corporation.