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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 |

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