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Revenue from Contracts with Customers - Schedule of Deferred Revenue and Customer Advances by Arrangement (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Change in Contract with Customer, Liability [Line Items] |  |
Beginning balance, January 1 | $ 24.8 | $ 17.5
Additions to deferred revenue and customer advances | 76.3 | 41.9
Amount of deferred revenue and customer advances recognized in income | (65.6) | (38.8)
Ending balance, March 31 | $ 35.5 | 25.2
Electro Scientific Industries Inc [Member] |  |
Change in Contract with Customer, Liability [Line Items] |  |
Deferred revenue and customer advances assumed |  | $ 4.6

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