Goodwill and Intangible Assets - Goodwill Roll Forward (Details) - USD ($) $ in Millions					3 Months Ended		12 Months Ended
		Sep. 26, 2020	Dec. 31, 2019		Dec. 31, 2020		Dec. 31, 2020		Dec. 31, 2019
Goodwill [Roll Forward]
Beginning balance							$ 4,116.7		$ 3,979.8
Impairments							(346.8)		(109.2)
Business divestitures							(115.6)		(42.2)
Business acquisitions							22.1		291.1
Purchase accounting adjustments							1.6
Currency translation adjustments							90.8		(2.8)
Ending balance			$ 4,116.7		$ 3,768.8		3,768.8		4,116.7
CSCA
Goodwill [Roll Forward]
Beginning balance							1,899.1		1,713.7
Impairments							0.0		0.0
Business divestitures							0.0		(42.2)
Business acquisitions							14.8		223.0
Purchase accounting adjustments							(10.4)
Currency translation adjustments							1.5		4.6
Ending balance			1,899.1		1,905.0		1,905.0		1,899.1
CSCI
Goodwill [Line Items]
Accumulated impairments			(868.4)		(868.4)		(868.4)		(868.4)
Goodwill [Roll Forward]
Beginning balance	[1]						1,203.7		1,151.3
Impairments	[1]						0.0		0.0
Business divestitures	[1]						(115.6)		0.0
Business acquisitions	[1]						7.3		68.1
Purchase accounting adjustments	[1]						12.0
Currency translation adjustments	[1]						83.3		(15.7)
Ending balance	[1]		1,203.7		1,190.7		1,190.7		1,203.7
RX
Goodwill [Line Items]
Accumulated impairments			(109.2)		(456.0)		(456.0)		(109.2)
Goodwill [Roll Forward]
Beginning balance	[2]						1,013.9		1,114.8
Impairments		$ (202.4)	(109.2)		(144.4)		(346.8)	[2]	(109.2)	[2]
Business divestitures	[2]						0.0		0.0
Business acquisitions	[2]						0.0		0.0
Purchase accounting adjustments	[2]						0.0
Currency translation adjustments	[2]						6.0		8.3
Ending balance		$ 811.1	$ 1,013.9	[2]	$ 673.1	[2]	$ 673.1	[2]	$ 1,013.9	[2]

[1] (1) We had accumulated goodwill impairments of $868.4 million as of December 31, 2019 and December 31, 2020.

[2] We had accumulated goodwill impairments of $109.2 million and $456.0 million as of December 31, 2019 and December 31, 2020, respectivel