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Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 17 years 6 months    
Gross Asset $ 256.1 $ 256.1  
Accumulated Amortization 188.7 184.4  
Intangible assets, net $ 67.4 71.7 $ 78.5
Intellectual property rights      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 19 years    
Gross Asset $ 69.9 70.0  
Accumulated Amortization 45.4 45.1  
Intangible assets, net $ 24.5 24.9  
Customer relationships and backlog      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 14 years 2 months 12 days    
Gross Asset $ 132.5 132.6  
Accumulated Amortization 91.4 87.8  
Intangible assets, net $ 41.1 44.8  
Drawings      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 40 years    
Gross Asset $ 11.1 11.1  
Accumulated Amortization 10.8 10.7  
Intangible assets, net $ 0.3 0.4  
Other      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Amortization Period of Definite Lived Assets (in years) 21 years    
Gross Asset $ 42.6 42.4  
Accumulated Amortization 41.1 40.8  
Intangible assets, net $ 1.5 $ 1.6