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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Feb. 01, 2019
Dec. 31, 2019
Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]      
Accumulated Amortization   $ 308.0 $ 350.6
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Accumulated Amortization   84.2 99.6
Patents, Trademarks, Trade Names and Other [Member]      
Finite-Lived Intangible Assets [Line Items]      
Accumulated Amortization   45.5 $ 47.8
Electro Scientific Industries Inc [Member]      
Finite-Lived Intangible Assets [Line Items]      
Acquired intangible assets, purchase price $ 316.2 316.2  
Finite lived intangible asset , gross favorable lease   6.4  
Electro Scientific Industries Inc [Member] | Completed Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Acquired intangible assets, purchase price   274.0  
Electro Scientific Industries Inc [Member] | Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Acquired intangible assets, purchase price $ 25.4 25.4  
Electro Scientific Industries Inc [Member] | Trademarks Tradenames and Backlog [Member]      
Finite-Lived Intangible Assets [Line Items]      
Acquired intangible assets, purchase price   16.8  
Electro Scientific Industries Inc [Member] | Patents, Trademarks, Trade Names and Other [Member]      
Finite-Lived Intangible Assets [Line Items]      
Accumulated Amortization   $ 3.4