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Acquisitions and Divestitures - Acquisitions (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 23, 2018
Dec. 08, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]              
Goodwill     $ 1,708,783,000   $ 1,708,783,000   $ 1,704,158,000
Finger Lakes Instrumentation (FLI)              
Business Acquisition [Line Items]              
Consideration transferred $ 23,600,000            
Aggregate purchase price, cash paid 20,200,000            
Contingent consideration $ 3,400,000            
Contingent consideration arrangements, period 24 months            
Goodwill $ 11,900,000            
Goodwill expected to be tax deductible 11,900,000            
Intangible assets $ 8,100,000            
thinXXS Microtechnology AG (thinXXS)              
Business Acquisition [Line Items]              
Aggregate purchase price, cash paid   $ 38,200,000          
Goodwill   25,100,000          
Intangible assets   10,600,000          
Long-term debt   $ 1,200,000          
Selling, general and administrative expenses              
Business Acquisition [Line Items]              
Acquisition-related transaction costs     $ 0 $ 500,000 $ 1,500,000 $ 700,000