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Goodwill - Rollforward of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Goodwill [Roll Forward]
Beginning balance			$ 8,399.3
Acquisitions			22.7
Impairment of goodwill	$ 0.0	$ 0.0	(85.3)	$ 0.0
Foreign currency translation and other			(39.0)
Ending balance	8,297.7		8,297.7
Professional Instrumentation
Goodwill [Roll Forward]
Beginning balance			7,242.6
Acquisitions			22.7
Impairment of goodwill			0.0
Foreign currency translation and other			(22.8)
Ending balance	7,242.5		7,242.5
Industrial Technologies
Goodwill [Roll Forward]
Beginning balance			1,156.7
Acquisitions			0.0
Impairment of goodwill			(85.3)
Foreign currency translation and other			(16.2)
Ending balance	$ 1,055.2		$ 1,055.2