v3.25.2
Summary of Significant Accounting Policies Revenue Recognition and Remaining performance obligation (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Rail Products Group [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Billed Contracts Receivable $ 4.0 $ 3.4
Rail Products Group [Member] | Rail Products [Domain]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 1,959.8  
Revenue, remaining performance obligation expected to be delivered in current year 36.70%  
Rail Products Group [Member] | Rail Products [Domain] | External Customers    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 1,686.4  
Rail Products Group [Member] | Rail Products [Domain] | Leasing & Services    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 273.4  
Leasing & Services    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Billed Contracts Receivable 10.4 $ 9.6
Leasing & Services | Leasing and Management [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 47.5  
Revenue, remaining performance obligation expected to be delivered in current year 18.80%  
Leasing & Services | Maintenance services    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 4.6  
Revenue, remaining performance obligation expected to be delivered in current year 100.00%