v3.25.4
Goodwill and Other Intangibles - Changes in Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]        
Goodwill, beginning balance   $ 1,582,714 $ 1,629,729  
Goodwill impairment $ 181,100 181,070 0 $ 0
Foreign currency translation adjustments   98,013 (47,015)  
Goodwill, ending balance   1,499,657 1,582,714 1,629,729
Ketjen        
Goodwill [Roll Forward]        
Goodwill accumulate impairment loss   187,800 6,800 6,800
Reportable Segments | Energy Storage        
Goodwill [Roll Forward]        
Goodwill, beginning balance   1,387,591 1,424,484  
Goodwill impairment   0    
Foreign currency translation adjustments   79,368 (36,893)  
Goodwill, ending balance   1,466,959 1,387,591 1,424,484
Reportable Segments | Specialties        
Goodwill [Roll Forward]        
Goodwill, beginning balance   32,577 32,639  
Goodwill impairment   0    
Foreign currency translation adjustments   121 (62)  
Goodwill, ending balance   32,698 32,577 32,639
Reportable Segments | Ketjen        
Goodwill [Roll Forward]        
Goodwill, beginning balance   162,546 172,606  
Goodwill impairment   181,070    
Foreign currency translation adjustments   18,524 (10,060)  
Goodwill, ending balance   $ 0 $ 162,546 $ 172,606