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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | $ 875.5 | $ 875.5
Accumulated Impairment Charges | (1.6) | (1.5)
Accumulated Amortization | (388.3) | (363.2)
Foreign Currency Translation | 0.7 | 1.4
Intangible assets, net | 486.3 | 512.2
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 | (222.8) | (209.8)
Foreign Currency Translation | (0.1) | (0.1)
Intangible assets, net | 223.4 | 236.4
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 | (115.2) | (104.8)
Foreign Currency Translation | 0.8 | 1.7
Intangible assets, net | 192.4 | 203.7
Patents, Trademarks, Trade Names and Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 120.9 | 120.9
Accumulated Impairment Charges | (0.1) |
Accumulated Amortization | (50.3) | (48.6)
Foreign Currency Translation |  | (0.2)
Intangible assets, net | $ 70.5 | $ 72.1

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