Segment Information - Sales (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Revenue from External Customer [Line Items]
Net sales	$ 749.0	$ 802.2	$ 2,276.9	$ 2,329.4
Instrumentation
Revenue from External Customer [Line Items]
Net sales	263.5	282.9	811.7	803.5
Operating Segments \| Instrumentation
Revenue from External Customer [Line Items]
Net sales	263.5	282.9	811.7	803.5
Operating Segments \| Instrumentation \| Marine Instrumentation
Revenue from External Customer [Line Items]
Net sales	101.5	114.4	320.7	331.0
Operating Segments \| Instrumentation \| Environmental Instrumentation
Revenue from External Customer [Line Items]
Net sales	100.4	102.6	304.0	276.4
Operating Segments \| Instrumentation \| Test and Measurement Instrumentation
Revenue from External Customer [Line Items]
Net sales	$ 61.6	$ 65.9	$ 187.0	$ 196.1

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details