Related Party Transactions - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020	Jan. 03, 2021
Related Party Transaction [Line Items]
Revenue recognized	$ 522.5	$ 451.1	$ 1,521.8	$ 1,249.6
Carlyle Investment Management, L.L.C. | Healthcare Equipment Company
Related Party Transaction [Line Items]
Inventories, purchased	1.3	0.0	2.2	0.0
Due to related party					$ 0.0
Carlyle Investment Management, L.L.C. | Health Care Diagnostics Companies
Related Party Transaction [Line Items]
Revenue recognized	3.2	0.4	5.0	1.3
Due to related party	1.2		1.2		1.2
Carlyle Investment Management, L.L.C. | Security Services Company
Related Party Transaction [Line Items]
Due to related party	0.1		0.1		0.1
Security service expense	0.2		0.8
Carlyle Investment Management, L.L.C. | Information Technology Company
Related Party Transaction [Line Items]
IT service fees	0.3	0.2	1.0	0.2
Due to related party	0.1		0.1		0.1
Carlyle Investment Management, L.L.C. | Consulting Services Company
Related Party Transaction [Line Items]
Consulting fees	0.1	0.3	1.3	0.7
Due to related party	0.0		0.0		0.3
Carlyle Investment Management, L.L.C. | Pharmacy Benefit Management
Related Party Transaction [Line Items]
Pharmacy related services, fees	1.5	1.6	4.4	4.6
Due to related party	0.4		$ 0.4		$ 0.6
Carlyle Investment Management, L.L.C. | Consulting Services Agreement
Related Party Transaction [Line Items]
Agreement, initial term			10 years
Annual management fee			$ 3.0
Management fee and other out-of-pocket expenses	$ 0.8	$ 0.8	$ 2.3	$ 2.3