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Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 17 years 9 months 18 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 895.8 | $ 908.2 |
Finite-Lived Intangible Assets, Accumulated Amortization | 417.1 | 389.1 |
Intangible assets, net | 478.7 | 519.1 | $ 503.7
Remainder of 2021 | 11.1 |  |
2022 | 42.7 |  |
2023 | 42.6 |  |
2024 | 41.7 |  |
2025 and after | $ 269.8 |  |
Intellectual Property Rights |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 15 years 1 month 6 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 132.3 | 133.2 |
Finite-Lived Intangible Assets, Accumulated Amortization | 54.1 | 53.4 |
Intangible assets, net | $ 78.2 | 79.8 |
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 18 years 3 months 18 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 614.3 | 623.7 |
Finite-Lived Intangible Assets, Accumulated Amortization | 263.4 | 241.9 |
Intangible assets, net | $ 350.9 | 381.8 |
Drawings |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 40 years |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 11.1 | 11.1 |
Finite-Lived Intangible Assets, Accumulated Amortization | 10.6 | 10.5 |
Intangible assets, net | $ 0.5 | 0.6 |
Other Intangible Assets |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 11 years 8 months 12 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 138.1 | 140.2 |
Finite-Lived Intangible Assets, Accumulated Amortization | 89.0 | 83.3 |
Intangible assets, net | $ 49.1 | $ 56.9 |

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