v3.25.3
Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 20 years 9 months 18 days    
Gross Asset $ 326.1 $ 319.8  
Accumulated Amortization 173.4 159.9  
Intangible assets, net $ 152.7 159.9 $ 87.1
Intellectual property rights      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 16 years 4 months 24 days    
Gross Asset $ 82.0 79.8  
Accumulated Amortization 44.3 42.4  
Intangible assets, net $ 37.7 37.4  
Customer relationships and backlog      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 20 years 6 months    
Gross Asset $ 194.6 191.0  
Accumulated Amortization 81.2 70.2  
Intangible assets, net $ 113.4 120.8  
Drawings      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 40 years    
Gross Asset $ 11.1 11.1  
Accumulated Amortization 10.9 10.8  
Intangible assets, net $ 0.2 0.3  
Other      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 25 years 10 months 24 days    
Gross Asset $ 38.4 37.9  
Accumulated Amortization 37.0 36.5  
Intangible assets, net $ 1.4 $ 1.4