Goodwill and Other Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill, purchase accounting adjustments	$ 74.7
Goodwill [Roll Forward]
Goodwill, beginning of period	6,133.1	$ 4,560.3
Goodwill attributable to acquisitions	2,192.9	1,601.2
Attributable to the Tektronix Video Business Combination	(40.2)
Foreign currency translation & other	38.8	(28.4)
Goodwill, end of period	8,399.3	6,133.1
Professional Instrumentation
Goodwill [Line Items]
Goodwill, purchase accounting adjustments	75.9
Goodwill [Roll Forward]
Goodwill, beginning of period	4,894.6	3,331.0
Goodwill attributable to acquisitions	2,192.9	1,571.8
Attributable to the Tektronix Video Business Combination	(40.2)
Foreign currency translation & other	3.1	(8.2)
Goodwill, end of period	7,126.3	4,894.6
Industrial Technologies
Goodwill [Line Items]
Goodwill, purchase accounting adjustments	(1.2)
Goodwill [Roll Forward]
Goodwill, beginning of period	1,238.5	1,229.3
Goodwill attributable to acquisitions	0.0	29.4
Attributable to the Tektronix Video Business Combination	0.0
Foreign currency translation & other	35.7	(20.2)
Goodwill, end of period	$ 1,273.0	$ 1,238.5

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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