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Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 17 years 9 months 18 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 900.2 | $ 908.2 |
Finite-Lived Intangible Assets, Accumulated Amortization | 408.9 | 389.1 |
Intangible assets, net | 491.3 | 519.1 | $ 503.7
Remainder of 2021 | 22.2 |  |
2022 | 42.8 |  |
2023 | 42.8 |  |
2024 | 41.8 |  |
2025 and after | $ 270.5 |  |
Intellectual Property Rights |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years 2 months 12 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 133.0 | 133.2 |
Finite-Lived Intangible Assets, Accumulated Amortization | 54.0 | 53.4 |
Intangible assets, net | $ 79.0 | 79.8 |
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 18 years 3 months 18 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 617.1 | 623.7 |
Finite-Lived Intangible Assets, Accumulated Amortization | 257.5 | 241.9 |
Intangible assets, net | $ 359.6 | 381.8 |
Drawings |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 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] |  |  |
Finite-Lived Intangible Asset, Useful Life | 11 years 8 months 12 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 139.0 | 140.2 |
Finite-Lived Intangible Assets, Accumulated Amortization | 86.8 | 83.3 |
Intangible assets, net | $ 52.2 | $ 56.9 |

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