Goodwill and Other Intangible Assets - Intangible categories (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Apr. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	$ 4,587.3			$ 4,587.3		$ 4,661.7
Accumulated Amortization	1,521.3			1,521.3		1,371.2
Indefinite-lived intangibles:	89.6			89.6		90.3
Total other intangible assets	4,676.9			4,676.9		4,752.0
Intangible assets amortization expense	85.3	$ 87.2		172.4	$ 172.8
Trademarks, trade names, and brands
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangibles:	51.7			51.7		52.1
In-process research and development
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangibles:	37.9			37.9		38.2
Distribution and license agreements and supply agreements
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	310.0			310.0		311.2
Accumulated Amortization	188.3			188.3		169.8
Developed product technology, formulations, and product rights
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	1,349.8			1,349.8		1,358.4
Accumulated Amortization	647.0			647.0		598.7
Customer relationships and distribution networks
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	1,608.7			1,608.7		1,642.0
Accumulated Amortization	513.2			513.2		460.6
Trademarks, trade names, and brands
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	1,304.3			1,304.3		1,335.4
Accumulated Amortization	159.8			159.8		129.5
Non-compete agreements
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	14.5			14.5		14.7
Accumulated Amortization	13.0			13.0		$ 12.6
RX
Finite And Indefinite Lived Assets By Major Class [Line Items]
Intangible assets amortization expense	$ 20.5	22.3		$ 41.1	$ 44.6
Impairment charge		$ 18.5	$ 12.2