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Business Segment, Geographic Area, and Significant Customer Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Gross profit $ 322.1 $ 239.6
Research and development 47.2 42.4
Selling, general and administrative 95.9 87.2
Acquisition and integration costs 6.2 2.2
Restructuring and other 4.9 0.4
Amortization of intangible assets 12.4 16.3
Asset impairment   1.2
Income from operations 155.5 89.9
Interest income 0.2 0.7
Interest expense 6.4 8.9
Other expense, net 1.1 0.4
Income before income taxes 148.2 81.3
Provision for income taxes 25.9 12.2
Net income 122.3 69.1
Vacuum & Analysis [Member]    
Segment Reporting Information [Line Items]    
Gross profit 205.0 140.8
Light & Motion [Member]    
Segment Reporting Information [Line Items]    
Gross profit 82.1 75.6
Equipment & Solutions [Member]    
Segment Reporting Information [Line Items]    
Gross profit $ 35.0 $ 23.2