Segment and Geographic Information - Adjusted EBITDA by Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Segment Reporting Information [Line Items]
Depreciation and amortization	$ (79.4)	$ (82.7)
interest expense, net	(32.5)	(43.4)
Loss on extinguishment of debt	0.0	(50.3)
Stock-based compensation	(2.6)	(3.5)
Restructuring and severance-related costs	(1.0)	(1.3)
Quidel acquisition-related costs	(5.7)	0.0
Tax indemnification income, net	0.2	0.2
Costs related to Ortho's initial public offering		(3.8)
EU medical device regulation transition cost	(0.7)	(0.9)
Other Adjustments	0.4	(2.5)
Income (Loss) before provision for income taxes	18.3	(35.8)
2014 Plan [Member]
Segment Reporting Information [Line Items]
Stock-based compensation	(2.5)	(3.5)
Operating Segments | Americas
Segment Reporting Information [Line Items]
Adjusted EBITDA	143.2	141.1
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Adjusted EBITDA	19.7	17.5
Operating Segments | Greater China
Segment Reporting Information [Line Items]
Adjusted EBITDA	24.7	25.2
Operating Segments | Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	17.0	19.4
Corporate Non Segment Member
Segment Reporting Information [Line Items]
Adjusted EBITDA	204.6	203.2
Corporate	$ 65.2	$ 50.8