Revenue Recognition - Schedule of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended
		Apr. 03, 2021	Mar. 28, 2020
Disaggregation of Revenue [Line Items]
Net sales	[1]	$ 1,010.0	$ 1,083.3
CSCA
Disaggregation of Revenue [Line Items]
Net sales	[2]	640.5	700.6
CSCA | Upper respiratory
Disaggregation of Revenue [Line Items]
Net sales	[2]	114.0	154.6
CSCA | Digestive health
Disaggregation of Revenue [Line Items]
Net sales	[2]	113.5	106.9
CSCA | Pain and sleep-aids
Disaggregation of Revenue [Line Items]
Net sales	[2]	92.4	120.4
CSCA | Nutrition
Disaggregation of Revenue [Line Items]
Net sales	[2]	92.0	102.2
CSCA | Healthy lifestyle
Disaggregation of Revenue [Line Items]
Net sales	[2]	75.5	85.8
CSCA | Oral self-care
Disaggregation of Revenue [Line Items]
Net sales	[2]	73.7	55.3
CSCA | Skincare and personal hygiene
Disaggregation of Revenue [Line Items]
Net sales	[2]	53.3	46.7
CSCA | Vitamins, minerals, and supplements
Disaggregation of Revenue [Line Items]
Net sales	[2]	7.8	6.4
CSCA | Other CSCA
Disaggregation of Revenue [Line Items]
Net sales	[2],[3]	18.3	22.3
CSCI
Disaggregation of Revenue [Line Items]
Net sales		369.5	382.7
CSCI | Upper respiratory
Disaggregation of Revenue [Line Items]
Net sales		42.9	84.1
CSCI | Digestive health
Disaggregation of Revenue [Line Items]
Net sales		8.5	6.0
CSCI | Pain and sleep-aids
Disaggregation of Revenue [Line Items]
Net sales		49.0	46.8
CSCI | Healthy lifestyle
Disaggregation of Revenue [Line Items]
Net sales		50.3	43.6
CSCI | Oral self-care
Disaggregation of Revenue [Line Items]
Net sales		25.5	23.2
CSCI | Skincare and personal hygiene
Disaggregation of Revenue [Line Items]
Net sales		107.0	94.7
CSCI | Vitamins, minerals, and supplements
Disaggregation of Revenue [Line Items]
Net sales		59.0	48.5
CSCI | Other CSCI
Disaggregation of Revenue [Line Items]
Net sales	[4]	$ 27.3	$ 35.8

[1] Derived from the location of the entity that sells to a third party.

[2] Includes net sales from our OTC contract manufacturing business.

[3] Consists primarily of diagnostic products and other miscellaneous or otherwise uncategorized product lines and markets, none of which is greater than 10% of the segment net sales.

[4] Consists primarily of our distribution business and other miscellaneous or otherwise uncategorized product lines and markets, none of which is greater than 10% of the segment net sales.