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Other Intangible Assets, Net (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Original amount | $ 80.9 | $ 79.0
Accumulated amortization | 42.4 | 36.2
Other intangible assets, net | $ 38.5 | $ 42.8
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets | 8 years |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets | 20 years |
Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets |  | 8 years
Original amount | $ 55.4 | $ 53.5
Accumulated amortization | 20.0 | 15.4
Other intangible assets, net | 35.4 | 38.1
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amount | 25.5 | 25.5
Accumulated amortization | 22.4 | 20.8
Other intangible assets, net | $ 3.1 | $ 4.7
Trademarks and trade names | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets | 15 months |
Trademarks and trade names | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets | 20 months |

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