Goodwill and Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 25, 2020	Jun. 26, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019	Dec. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Non-restructuring impairment charges	$ 0.0	$ 63.5	$ 0.0	$ 63.5	$ 113.5
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	10,592.4			10,592.4		$ 10,654.7
Accumulated amortization	4,516.8			4,516.8		3,917.0
Intangible assets, net	6,355.9			6,355.9		7,018.0
Non-Amortizable intangible assets, gross	280.3			280.3		280.3
Trademarks
Schedule of Intangible Asset by Major Class [Line Items]
Non-Amortizable intangible assets, gross	35.0			35.0		35.0
In-process Research and Development
Schedule of Intangible Asset by Major Class [Line Items]
Non-Amortizable intangible assets, gross	245.3			245.3		245.3
Completed Technology
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	10,394.6			10,394.6		10,456.9
Accumulated amortization	4,417.0			4,417.0		3,822.8
Trademarks
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	77.7			77.7		77.7
Accumulated amortization	22.7			22.7		20.1
Licensing Agreements [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	120.1			120.1		120.1
Accumulated amortization	77.1			77.1		74.1
Ofirmev
Schedule of Intangible Asset by Major Class [Line Items]
Intangible assets, net	26.1			26.1
Terlipressin [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Intangible assets, net	$ 81.0			$ 81.0		$ 81.0