Goodwill and Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 27, 2019	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Schedule of Intangible Asset by Major Class [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		$ 388.0	$ 220.3
Other Asset Impairment Charges		388.0	3,893.1	$ 63.7
Intangible asset amortization		853.4	740.2	$ 694.5
Amortizable:
Finite-lived intangible assets, gross	$ 10,654.7	10,654.7	10,697.4
Accumulated amortization	3,917.0	3,917.0	3,082.9
Non-Amortizable:
Indefinite-lived intangible assets, gross	280.3	280.3	668.3
Trademarks
Non-Amortizable:
Indefinite-lived intangible assets, gross	35.0	35.0	35.0
In-process research and development
Non-Amortizable:
Indefinite-lived intangible assets, gross	245.3	245.3	633.3
Completed Technology
Amortizable:
Finite-lived intangible assets, gross	10,456.9	10,456.9	10,467.9
Accumulated amortization	3,822.8	3,822.8	2,980.6
Licensing Agreements
Amortizable:
Finite-lived intangible assets, gross	120.1	120.1	120.1
Accumulated amortization	74.1	74.1	70.1
Customer relationships
Amortizable:
Finite-lived intangible assets, gross	0.0	0.0	27.5
Accumulated amortization	0.0	0.0	14.1
Trademarks
Amortizable:
Finite-lived intangible assets, gross	77.7	77.7	81.9
Accumulated amortization	20.1	20.1	18.1
Sucampo [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Intangible asset amortization		$ 70.9	$ 62.9
VTS-270 [Member] | Sucampo [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Other Asset Impairment Charges	$ 274.5