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Goodwill and Intangible Assets - Acquired Intangible Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | $ 875.5 | $ 875.5
Accumulated Impairment Charges | (1.5) | (1.5)
Accumulated Amortization | (363.2) | (308.0)
Foreign Currency Translation | 1.4 | (1.4)
Intangible assets, net | 512.2 | 564.6
Completed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 446.4 | 446.4
Accumulated Impairment Charges | (0.1) | (0.1)
Accumulated Amortization | (209.8) | (178.3)
Foreign Currency Translation | (0.1) | (0.2)
Intangible assets, net | 236.4 | 267.8
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 308.2 | 308.2
Accumulated Impairment Charges | (1.4) | (1.4)
Accumulated Amortization | (104.8) | (84.2)
Foreign Currency Translation | 1.7 | (1.4)
Intangible assets, net | 203.7 | 221.2
Patents, Trademarks, Trade Names and Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 120.9 | 120.9
Accumulated Amortization | (48.6) | (45.5)
Foreign Currency Translation | (0.2) | 0.2
Intangible assets, net | $ 72.1 | $ 75.6

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