Note 1. Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Sales-type Lease, Revenue		$ 0.0	$ 0.0	$ 160.5
Billed Contracts Receivable		4.5	$ 4.4
Railcar Leasing and Management Services Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 71.3
Revenue, remaining performance obligation expected to be delivered in current year		21.70%
Rail Products Group [Member] | Railcar products [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 1,516.8
Revenue, remaining performance obligation expected to be delivered in current year		69.10%
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		$ 1,018.1
Rail Products Group [Member] | Railcar products [Domain] | Leasing [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		498.7
Rail Products Group [Member] | Sustainable Railcar Conversions
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	[1]	$ 111.5
Revenue, remaining performance obligation expected to be delivered in current year	[1]	95.70%
Rail Products Group [Member] | Components and maintenance services [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 3.0
Revenue, remaining performance obligation expected to be delivered in current year		100.00%

[1] (1) During 2021, the Rail Products Group introduced a sustainable railcar conversion program whereby certain tank cars and freight cars are converted or upgraded to better meet changing market demands.