Segment Information - Detailed Segment Data (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 27, 2020	Mar. 29, 2019
Segment Reporting Information [Line Items]
Sales	$ 1,713.5	$ 1,592.9
Operating profit	119.6	217.3
Interest expense, net	(43.6)	(25.3)
Other non-operating expenses, net	(4.6)	0.4
Earnings from continuing operations before income taxes	71.4	192.4
Operating Segments | Professional Instrumentation
Segment Reporting Information [Line Items]
Sales	1,104.4	977.7
Operating profit	144.5	142.7
Operating Segments | Industrial Technologies
Segment Reporting Information [Line Items]
Sales	609.1	615.2
Operating profit	(1.5)	98.8
Other
Segment Reporting Information [Line Items]
Operating profit	$ (23.4)	$ (24.2)