Goodwill and Intangible Assets Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 25, 2020	Dec. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible asset amortization	$ 581.1	$ 771.2	$ 853.4
Finite-Lived Intangible Assets [Line Items]
Other Asset Impairment Charges	154.9	63.5	388.0
Indefinite-lived intangible assets, gross	116.0	280.3
Intangible Assets, Net (Excluding Goodwill)	5,448.4	6,184.5
VTS-270 [Member]
Finite-Lived Intangible Assets [Line Items]
Other Asset Impairment Charges			$ 274.5
Amitiza
Finite-Lived Intangible Assets [Line Items]
Other Asset Impairment Charges	90.4
MNK-6105 [Member]
Finite-Lived Intangible Assets [Line Items]
Other Asset Impairment Charges	64.5
Terlipressin [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	81.0	$ 81.0
StrataGraft [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 99.8