v3.26.1
Revenue 606 (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues $ 485.1 $ 506.2 $ 977.1 $ 1,091.6  
Operating Segments [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues 539.6 595.9 1,125.4 1,303.8  
Intersegment Eliminations [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues (54.5) (89.7) (148.3) (212.2)  
Rail Products Group [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Billed Contracts Receivable 5.6   5.6   $ 4.9
Rail Products Group [Member] | Operating Segments [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues 258.5 293.5 558.5 714.0  
Rail Products Group [Member] | Rail Products [Domain]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 1,585.2   $ 1,585.2    
Revenue, remaining performance obligation expected to be delivered in current year 40.00%   40.00%    
Rail Products Group [Member] | Rail Products [Domain] | Operating Segments [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues $ 230.1 262.8 $ 505.3 650.6  
Rail Products Group [Member] | Rail Products [Domain] | External Customers          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount 1,409.0   1,409.0    
Rail Products Group [Member] | Rail Products [Domain] | Leasing & Services          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount 176.2   176.2    
Rail Products Group [Member] | Parts & Components | Operating Segments [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues 28.4 30.7 53.2 63.4  
Rail Products Group [Member] | Sustainable Railcar Conversions          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 28.2   $ 28.2    
Revenue, remaining performance obligation expected to be delivered in current year 100.00%   100.00%    
Leasing & Services          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Billed Contracts Receivable $ 14.0   $ 14.0   $ 10.9
Leasing & Services | Operating Segments [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues 281.1 302.4 566.9 589.8  
Leasing & Services | Leasing and Management [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 79.0   $ 79.0    
Revenue, remaining performance obligation expected to be delivered in current year 13.00%   13.00%    
Leasing & Services | Leasing and Management [Member] | Operating Segments [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues $ 206.0 233.5 $ 416.3 452.5  
Leasing & Services | Maintenance services          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 3.9   $ 3.9    
Revenue, remaining performance obligation expected to be delivered in current year 100.00%   100.00%    
Leasing & Services | Maintenance services | Operating Segments [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues $ 63.4 59.3 $ 126.6 118.5  
Leasing & Services | Digital & Logistics Services | Operating Segments [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenues $ 11.7 $ 9.6 $ 24.0 $ 18.8