v3.25.1
Summary of Significant Accounting Policies Revenue Recognition and Remaining performance obligation (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Rail Products Group [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Billed Contracts Receivable $ 3.7 $ 3.4
Rail Products Group [Member] | Rail Products [Domain]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 1,886.6  
Revenue, remaining performance obligation expected to be delivered in current year 40.30%  
Rail Products Group [Member] | Rail Products [Domain] | External Customers    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 1,702.2  
Rail Products Group [Member] | Rail Products [Domain] | Leasing & Services    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 184.4  
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%  
Leasing & Services    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Billed Contracts Receivable $ 11.5 $ 9.6
Leasing & Services | Leasing and Management [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 52.8  
Revenue, remaining performance obligation expected to be delivered in current year 26.00%  
Leasing & Services | Maintenance services    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 3.5  
Revenue, remaining performance obligation expected to be delivered in current year 100.00%