Segment Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020		Sep. 28, 2019		Dec. 31, 2019
Segment Reporting Information [Line Items]
Total Assets		$ 11,576.0		$ 11,576.0				$ 11,301.4
Net sales	[1]	1,213.7	$ 1,191.1	3,773.8		$ 3,514.6
Operating Income (Loss)		(95.5)	54.4	167.6		211.7
Intangible Asset Amortization		73.9	78.7	219.3		227.7
CSCA
Segment Reporting Information [Line Items]
Total Assets		4,747.2		4,747.2				3,990.2
Net sales		664.0	613.3	1,992.2	[2]	1,777.2	[2]
Operating Income (Loss)		123.6	81.3	354.5		283.3
Intangible Asset Amortization		12.4	12.6	38.6		31.9
CSCI
Segment Reporting Information [Line Items]
Total Assets		4,606.9		4,606.9				4,682.7
Net sales		339.0	347.5	1,042.8		1,025.8
Operating Income (Loss)		10.2	13.2	45.7		18.4
Intangible Asset Amortization		40.2	43.3	116.9		130.4
RX
Segment Reporting Information [Line Items]
Total Assets		2,221.9		2,221.9				$ 2,628.5
Net sales		210.7	230.3	738.8		711.6
Operating Income (Loss)		(180.6)	19.7	(81.2)		95.0
Intangible Asset Amortization		21.3	22.8	63.8		65.4
Unallocated
Segment Reporting Information [Line Items]
Net sales		0.0	0.0	0.0		0.0
Operating Income (Loss)		(48.7)	(59.8)	(151.4)		(185.0)
Intangible Asset Amortization		$ 0.0	$ 0.0	$ 0.0		$ 0.0

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

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