Segment Information - Detailed Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Segment Reporting Information [Line Items]
Sales	$ 1,571.2	$ 1,864.7	$ 3,284.7	$ 3,457.6
Operating profit	191.1	249.5	310.7	466.8
Interest expense, net	(43.2)	(44.4)	(86.8)	(69.7)
Other non-operating income (expense), net	5.3	(0.8)	0.7	(0.4)
Earnings from continuing operations before income taxes	153.2	204.3	224.6	396.7
Operating Segments | Professional Instrumentation
Segment Reporting Information [Line Items]
Sales	1,037.5	1,165.6	2,141.9	2,143.3
Operating profit	135.6	129.9	280.1	272.6
Operating Segments | Industrial Technologies
Segment Reporting Information [Line Items]
Sales	533.7	699.1	1,142.8	1,314.3
Operating profit	82.6	145.0	81.1	243.8
Other
Segment Reporting Information [Line Items]
Operating profit	$ (27.1)	$ (25.4)	$ (50.5)	$ (49.6)