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Segment Information - Detailed Segment Data (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 28, 2018 USD ($)	Jun. 29, 2018 USD ($)	Mar. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 29, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| segment									2
Segment Reporting Information [Line Items]
Sales									$ 6,452.7	$ 5,756.1	$ 5,378.2
Operating profit	$ 294.5	$ 281.6	$ 324.4	$ 277.9	$ 305.0	$ 301.4	$ 292.9	$ 243.7	1,178.4	1,143.0	1,061.7
Identifiable assets	12,905.6				10,500.6				12,905.6	10,500.6	8,189.8
Depreciation and amortization									260.8	158.3	160.9
Capital expenditures, gross									112.3	111.1	110.1
Discontinued Operations
Segment Reporting Information [Line Items]
Identifiable assets	30.0				871.0				30.0	871.0	836.7
Operating Segments \| Professional Instrumentation
Segment Reporting Information [Line Items]
Sales									3,655.1	3,139.1	2,891.6
Operating profit									749.6	712.9	645.1
Identifiable assets	8,592.6				5,588.1				8,592.6	5,588.1	3,905.2
Depreciation and amortization									168.7	82.0	99.4
Capital expenditures, gross									58.4	37.0	36.2
Operating Segments \| Industrial Technologies
Segment Reporting Information [Line Items]
Sales									2,797.6	2,617.0	2,486.6
Operating profit									525.6	503.6	480.3
Identifiable assets	3,011.2				2,902.7				3,011.2	2,902.7	2,458.1
Depreciation and amortization									88.7	70.3	60.2
Capital expenditures, gross									44.8	71.8	64.9
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating profit									(96.8)	(73.5)	(63.7)
Identifiable assets	$ 1,271.8				$ 1,138.8				1,271.8	1,138.8	989.8
Depreciation and amortization									3.4	6.0	1.3
Capital expenditures, gross									$ 9.1	$ 2.3	$ 9.0