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Goodwill and Intangible Assets (Summary Of Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Gross Asset $ 1,024.1 $ 814.2  
Accumulated Amortization 451.2 394.9  
Net $ 572.9 419.3 $ 308.9
Weighted  Average Amortization Period of Finite Lived Assets (in years) 18 years 1 month 6 days    
Intellectual property rights      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Gross Asset $ 66.2 65.5  
Accumulated Amortization 17.9 15.4  
Net $ 48.3 50.1  
Weighted  Average Amortization Period of Finite Lived Assets (in years) 11 years 3 months 18 days    
Customer relationships and backlog      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Gross Asset $ 771.0 610.5  
Accumulated Amortization 331.5 293.9  
Net $ 439.5 316.6  
Weighted  Average Amortization Period of Finite Lived Assets (in years) 18 years 10 months 24 days    
Developed technology      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Gross Asset $ 112.0 66.4  
Accumulated Amortization 37.6 26.8  
Net $ 74.4 39.6  
Weighted  Average Amortization Period of Finite Lived Assets (in years) 6 years    
Other      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Gross Asset $ 74.9 71.8  
Accumulated Amortization 64.2 58.8  
Net $ 10.7 $ 13.0  
Weighted  Average Amortization Period of Finite Lived Assets (in years) 12 years 3 months 18 days