Goodwill and Other Intangible Assets - Intangible categories (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 31, 2017
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	$ 4,417.6		$ 4,417.6		$ 4,661.7
Accumulated Amortization	1,458.3		1,458.3		1,371.2
Indefinite-lived intangibles:	47.8		47.8		90.3
Total other intangible assets	4,465.4		4,465.4		4,752.0
Intangible assets amortization expense	84.3	$ 88.5	256.8	$ 261.3
Trademarks, trade names, and brands
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangibles:	18.5		18.5		52.1
In-process research and development
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangibles:	29.3		29.3		38.2
Reclassified Indefinite-lived Intangible Asset [Member]
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	5.4		5.4
Distribution and license agreements and supply agreements
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	180.9		180.9		311.2
Accumulated Amortization	95.9		95.9		169.8
Developed product technology, formulations, and product rights
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	1,324.2		1,324.2		1,358.4
Accumulated Amortization	634.0		634.0		598.7
Customer relationships and distribution networks
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	1,601.7		1,601.7		1,642.0
Accumulated Amortization	541.3		541.3		460.6
Trademarks, trade names, and brands
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	1,296.3		1,296.3		1,335.4
Accumulated Amortization	173.9		173.9		129.5
Non-compete agreements
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	14.5		14.5		14.7
Accumulated Amortization	13.2		13.2		$ 12.6
RX
Finite And Indefinite Lived Assets By Major Class [Line Items]
Intangible assets amortization expense	20.5	21.0	61.6	$ 65.6
Impairment charge		18.5	12.7
CHCA
Finite And Indefinite Lived Assets By Major Class [Line Items]
Impairment charge			8.5
Impairment of indefinite lived intangible assets		27.7
CHCA | Developed product technology, formulations, and product rights
Finite And Indefinite Lived Assets By Major Class [Line Items]
Impairment charge	41.6
CHCA | Customer relationships and distribution networks
Finite And Indefinite Lived Assets By Major Class [Line Items]
Impairment charge		2.8
CHCA | Trademarks, trade names, and brands
Finite And Indefinite Lived Assets By Major Class [Line Items]
Impairment charge		$ 4.5
Measured at fair value on a non-recurring basis
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangibles:	$ 46.7		$ 46.7