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Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 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 |  |
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year | $ 33.3 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 42.9 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 42.8 |  |
Intangible assets, net | 503.0 | $ 520.3 | $ 505.1
Finite-Lived Intangible Assets, Accumulated Amortization | 445.5 | 437.5 |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 42.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 948.5 | 957.8 |
Finite-Lived Intangible Assets, Amortization Expense, After Year Four | $ 271.0 |  |
Intellectual Property Rights |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years 2 months 12 days |  |
Intangible assets, net | $ 79.1 | 79.8 |
Finite-Lived Intangible Assets, Accumulated Amortization | 58.6 | 58.4 |
Intangible Assets, Gross (Excluding Goodwill) | $ 137.7 | 138.2 |
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 18 years 4 months 24 days |  |
Intangible assets, net | $ 368.4 | 383.0 |
Finite-Lived Intangible Assets, Accumulated Amortization | 287.8 | 280.6 |
Intangible Assets, Gross (Excluding Goodwill) | $ 656.2 | 663.6 |
Drawings |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 40 years |  |
Intangible assets, net | $ 0.6 | 0.6 |
Finite-Lived Intangible Assets, Accumulated Amortization | 10.5 | 10.5 |
Intangible Assets, Gross (Excluding Goodwill) | $ 11.1 | 11.1 |
Other Intangible Assets |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 11 years 8 months 12 days |  |
Intangible assets, net | $ 54.9 | 56.9 |
Finite-Lived Intangible Assets, Accumulated Amortization | 88.6 | 88.0 |
Intangible Assets, Gross (Excluding Goodwill) | $ 143.5 | $ 144.9 |

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