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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | $ 589.5 | $ 512.2
Completed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | 321.7 | 236.4
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | 196.7 | 203.7
Patents, Trademarks, Trade Names and Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | 71.1 | $ 72.1
Photon Control Inc [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | 121.0 |
Photon Control Inc [Member] | Completed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | 110.0 |
Photon Control Inc [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | 9.4 |
Photon Control Inc [Member] | Patents, Trademarks, Trade Names and Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | $ 1.6 |

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