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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 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]                
Gross profit $ 348.4     $ 262.0     $ 1,025.7 $ 747.9
Research and development 51.7     42.5     148.9 127.7
Selling, general and administrative 95.8     87.0     288.9 260.3
Acquisition and integration costs 8.6     0.5     20.8 3.4
Restructuring and other 2.0     3.1     9.9 6.8
Amortization of intangible assets 15.0     12.5     40.1 42.6
Asset impairment               1.2
COVID-19 related net credits               (1.2)
Income from operations 175.3     116.4     517.1 307.1
Interest income 0.1     0.1     0.4 1.1
Interest expense 6.3     6.6     19.1 22.7
Other expense, net 2.9     1.1     11.5 3.0
Income before income taxes 166.2     108.8     486.9 282.5
Provision for income taxes 33.8     17.1     85.7 48.0
Net income 132.4 $ 146.5 $ 122.3 91.7 $ 73.7 $ 69.1 401.2 234.5
Vacuum & Analysis [Member]                
Segment Reporting Information [Line Items]                
Gross profit 226.3     163.5     643.8 444.1
Light & Motion [Member]                
Segment Reporting Information [Line Items]                
Gross profit 100.6     76.0     272.6 227.8
Equipment & Solutions [Member]                
Segment Reporting Information [Line Items]                
Gross profit $ 21.5     $ 22.5     $ 109.3 $ 76.0