Revenue Recognition - Schedule of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020		Sep. 28, 2019
Disaggregation of Revenue [Line Items]
Net sales	[1]	$ 1,213.7	$ 1,191.1	$ 3,773.8		$ 3,514.6
CSCA
Disaggregation of Revenue [Line Items]
Net sales		664.0	613.3	1,992.2	[2]	1,777.2	[2]
CSCA | Upper respiratory
Disaggregation of Revenue [Line Items]
Net sales		114.2	123.4	385.5	[2]	377.4	[2]
CSCA | Digestive health
Disaggregation of Revenue [Line Items]
Net sales		107.1	85.0	326.1	[2]	293.6	[2]
CSCA | Pain and sleep-aids
Disaggregation of Revenue [Line Items]
Net sales		100.6	89.4	318.7	[2]	272.0	[2]
CSCA | Nutrition
Disaggregation of Revenue [Line Items]
Net sales		100.1	97.1	290.9	[2]	282.6	[2]
CSCA | Healthy lifestyle
Disaggregation of Revenue [Line Items]
Net sales		86.1	87.9	253.4	[2]	250.0	[2]
CSCA | Oral self-care
Disaggregation of Revenue [Line Items]
Net sales		81.1	54.2	199.6	[2]	54.2	[2]
CSCA | Skincare and personal hygiene
Disaggregation of Revenue [Line Items]
Net sales		49.2	45.4	138.8	[2]	136.7	[2]
CSCA | Vitamins, minerals, and supplements
Disaggregation of Revenue [Line Items]
Net sales		6.3	6.2	19.1	[2]	18.7	[2]
CSCA | Animal health
Disaggregation of Revenue [Line Items]
Net sales		0.0	1.8	0.0	[2]	43.7	[2]
CSCA | Other CSCA
Disaggregation of Revenue [Line Items]
Net sales		19.3	22.9	60.1	[2],[3]	48.3	[2],[3]
CSCI
Disaggregation of Revenue [Line Items]
Net sales		339.0	347.5	1,042.8		1,025.8
CSCI | Upper respiratory
Disaggregation of Revenue [Line Items]
Net sales		62.3	72.1	191.9		193.9
CSCI | Digestive health
Disaggregation of Revenue [Line Items]
Net sales		6.8	5.3	17.9		19.3
CSCI | Pain and sleep-aids
Disaggregation of Revenue [Line Items]
Net sales		49.0	40.5	136.0		120.3
CSCI | Healthy lifestyle
Disaggregation of Revenue [Line Items]
Net sales		40.6	38.2	124.7		134.2
CSCI | Oral self-care
Disaggregation of Revenue [Line Items]
Net sales		25.2	24.3	68.8		27.7
CSCI | Skincare and personal hygiene
Disaggregation of Revenue [Line Items]
Net sales		83.1	88.9	275.4		296.5
CSCI | Vitamins, minerals, and supplements
Disaggregation of Revenue [Line Items]
Net sales		52.9	46.2	139.9		133.1
CSCI | Other CSCI
Disaggregation of Revenue [Line Items]
Net sales		19.1	32.0	88.2	[4]	100.8	[4]
RX
Disaggregation of Revenue [Line Items]
Net sales		$ 210.7	$ 230.3	$ 738.8		$ 711.6

[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 liquid licensed products, 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.