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Segment Information - Detailed Segment Data (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 27, 2019 USD ($)	Jun. 28, 2019 USD ($)	Mar. 29, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 28, 2018 USD ($)	Jun. 29, 2018 USD ($)	Mar. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| segment									2
Segment Reporting Information [Line Items]
Sales	$ 2,002.4	$ 1,860.0	$ 1,864.7	$ 1,592.9	$ 1,757.5	$ 1,601.2	$ 1,601.8	$ 1,492.2	$ 7,320.0	$ 6,452.7	$ 5,756.1
Operating profit	295.2	$ 242.1	$ 249.5	$ 217.3	294.5	$ 281.6	$ 324.4	$ 277.9	1,004.1	1,178.4	1,143.0
Identifiable assets	17,439.0				12,905.6				17,439.0	12,905.6	10,500.6
Depreciation and amortization									426.2	260.8	158.3
Capital expenditures, gross									112.5	112.3	111.1
Discontinued Operations
Segment Reporting Information [Line Items]
Identifiable assets	3.2				30.0				3.2	30.0	871.0
Operating Segments
Segment Reporting Information [Line Items]
Identifiable assets	15,955.7				11,603.8				15,955.7	11,603.8	8,490.8
Operating Segments \| Professional Instrumentation
Segment Reporting Information [Line Items]
Sales									4,427.8	3,655.1	3,139.1
Operating profit									547.9	744.6	712.9
Identifiable assets	13,005.5				8,592.6				13,005.5	8,592.6	5,588.1
Depreciation and amortization									337.5	168.7	82.0
Capital expenditures, gross									65.0	58.4	37.0
Operating Segments \| Industrial Technologies
Segment Reporting Information [Line Items]
Sales									2,892.2	2,797.6	2,617.0
Operating profit									553.9	525.6	503.6
Identifiable assets	2,950.2				3,011.2				2,950.2	3,011.2	2,902.7
Depreciation and amortization									87.0	88.7	70.3
Capital expenditures, gross									40.7	44.8	71.8
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating profit									(97.7)	(91.8)	(73.5)
Identifiable assets	$ 1,480.1				$ 1,271.8				1,480.1	1,271.8	1,138.8
Depreciation and amortization									1.7	3.4	6.0
Capital expenditures, gross									$ 6.8	$ 9.1	$ 2.3