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Segment Information (Sales By Major Product Group) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 31, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Sales | $ 4,868.4 | $ 4,378.0 | $ 4,444.5 | $ 4,220.2 | $ 4,604.5 | $ 4,173.6 | $ 4,247.6 | $ 4,022.8 | $ 17,911.1 | $ 17,048.5 | $ 15,518.8
Analytical and physical instrumentation |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,463.8 | 2,437.0 | 2,232.9
Research and medical products |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 13,512.6 | 12,686.0 | 11,512.4
Product Identification |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 1,934.7 | $ 1,925.5 | $ 1,773.5

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