Goodwill and Intangible Assets - Intangible categories (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 31, 2019
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangibles:	$ 42.3		$ 42.3		$ 68.8
Gross	4,688.3		4,688.3		4,685.1
Accumulated Amortization	1,808.5		1,808.5		1,763.9
Total other intangible assets	4,730.6		4,730.6		4,753.9
Intangible assets amortization expense	72.2	$ 73.6	145.4	$ 149.0
Impairment charges	0.0	27.8	0.0	31.9
Distribution and license agreements and supply agreements
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	133.4		133.4		126.7
Accumulated Amortization	81.1		81.1		81.1
Developed product technology, formulations, and product rights
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	1,306.9		1,306.9		1,392.8
Accumulated Amortization	709.1		709.1		755.3
Customer relationships and distribution networks
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	1,821.0		1,821.0		1,805.6
Accumulated Amortization	727.7		727.7		671.4
Trademarks, trade names, and brands
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	1,421.9		1,421.9		1,353.5
Accumulated Amortization	285.7		285.7		250.1
Non-compete agreements
Finite And Indefinite Lived Assets By Major Class [Line Items]
Gross	5.1		5.1		6.5
Accumulated Amortization	4.9		4.9		6.0
Trademarks, trade names, and brands
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangibles:	3.8		3.8		18.8
In-process research and development
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangibles:	38.5		38.5		$ 50.0
Impairment of indefinite lived intangible assets				4.1
RX
Finite And Indefinite Lived Assets By Major Class [Line Items]
Intangible assets amortization expense	$ 21.2	21.3	$ 42.5	$ 42.6
Generic Product | RX
Finite And Indefinite Lived Assets By Major Class [Line Items]
Impairment charges		$ 27.8