Goodwill and Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 16, 2022	Jul. 01, 2022	Jun. 16, 2022	Jun. 25, 2021	Jul. 01, 2022	Jun. 16, 2022	Jun. 25, 2021	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Non-restructuring impairment charges		$ 0.0				$ 0.0	$ 64.5
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 2,918.9	2,918.9	$ 2,918.9		$ 2,918.9	2,918.9		$ 10,601.8
Accumulated amortization		45.5			45.5			5,269.4
Intangible assets, net		3,106.7			3,106.7			5,448.4
Non-Amortizable intangible assets, gross	233.3	233.3	233.3		233.3	233.3		116.0
Intangible Assets, Gross (Excluding Goodwill)	3,152.2		3,152.2			3,152.2
Non-restructuring impairment charges		0.0				0.0	64.5
Amortization of Intangible Assets		$ 45.5	$ 126.7	$ 145.2		$ 281.8	$ 290.5
Loss from continuing operations		$ (4.83)	$ (2.29)	$ (1.25)		$ (3.70)	$ (2.96)
Reorganization, Chapter 11, Plan Effect Adjustment
Schedule of Intangible Asset by Major Class [Line Items]
Intangible assets, net	0.0		$ 0.0			$ 0.0
Reorganization, Chapter11, Post Adjustment, Successor
Schedule of Intangible Asset by Major Class [Line Items]
Intangible assets, net	3,152.2		3,152.2			3,152.2
Trademarks
Schedule of Intangible Asset by Major Class [Line Items]
Non-Amortizable intangible assets, gross		$ 0.0			0.0			35.0
In-process Research and Development
Schedule of Intangible Asset by Major Class [Line Items]
Non-Amortizable intangible assets, gross		233.3			233.3			81.0
Completed Technology
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross		2,918.9			2,918.9			10,404.0
Accumulated amortization		45.5			45.5			5,160.4
Trademarks
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross		0.0			0.0			77.7
Accumulated amortization		0.0			0.0			26.9
Licensing Agreements [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross		0.0			0.0			120.1
Accumulated amortization		0.0			0.0			$ 82.1
Terlipressin [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Intangible assets, net		104.8			$ 104.8
Non-Amortizable intangible assets, gross	$ 104.8		$ 104.8			$ 104.8
Terlipressin [Member] | Indefinite-lived Intangible Assets
Schedule of Intangible Asset by Major Class [Line Items]
Discount Rate, Present Value of Future Cash Flows	15.00%		15.00%			15.00%
StrataGraft [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 56.8		$ 56.8			$ 56.8
Finite-Lived Intangible Asset, Useful Life	11 years
StrataGraft [Member] | Finite-Lived Intangible Assets
Schedule of Intangible Asset by Major Class [Line Items]
Discount Rate, Present Value of Future Cash Flows	14.00%		14.00%			14.00%
Amitiza [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 84.5		$ 84.5			$ 84.5
Finite-Lived Intangible Asset, Useful Life	3 years
Amitiza [Member] | Finite-Lived Intangible Assets
Schedule of Intangible Asset by Major Class [Line Items]
Discount Rate, Present Value of Future Cash Flows	14.00%		14.00%			14.00%
Amitiza [Member] | Change in Accounting Method Accounted for as Change in Estimate
Schedule of Intangible Asset by Major Class [Line Items]
Amortization of Intangible Assets			$ 9.3			$ 21.7
Loss from continuing operations					$ 0.11	$ 0.26
Acthar
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 1,069.0		$ 1,069.0			$ 1,069.0
Finite-Lived Intangible Asset, Useful Life	13 years 6 months
Acthar | Finite-Lived Intangible Assets
Schedule of Intangible Asset by Major Class [Line Items]
Discount Rate, Present Value of Future Cash Flows	14.20%		14.20%			14.20%
Therakos [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 913.8		$ 913.8			$ 913.8
Finite-Lived Intangible Asset, Useful Life	10 years
Therakos [Member] | Finite-Lived Intangible Assets
Schedule of Intangible Asset by Major Class [Line Items]
Discount Rate, Present Value of Future Cash Flows	14.00%		14.00%			14.00%
Inomax
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 652.9		$ 652.9			$ 652.9
Finite-Lived Intangible Asset, Useful Life	9 years
Inomax | Finite-Lived Intangible Assets
Schedule of Intangible Asset by Major Class [Line Items]
Discount Rate, Present Value of Future Cash Flows	14.00%		14.00%			14.00%
StrataGraft PRV
Schedule of Intangible Asset by Major Class [Line Items]
Other Indefinite-lived Intangible Assets	$ 100.0		$ 100.0			$ 100.0
StrataGraft PRV | General Unsecured Claims Trust
Schedule of Intangible Asset by Major Class [Line Items]
Proceeds from Sale of Intangible Assets		35.0
StrataGraft PRV | Mallinckrodt
Schedule of Intangible Asset by Major Class [Line Items]
Proceeds from Sale of Intangible Assets		$ 65.0
StrataGraft PRV | Reorganization, Chapter 11, Plan Effect Adjustment
Schedule of Intangible Asset by Major Class [Line Items]
Other Indefinite-lived Intangible Assets	100.0		100.0			100.0
Generics
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 71.4		$ 71.4			$ 71.4
Finite-Lived Intangible Asset, Useful Life	5 years
Generics | Finite-Lived Intangible Assets
Schedule of Intangible Asset by Major Class [Line Items]
Discount Rate, Present Value of Future Cash Flows	13.30%		13.30%			13.30%
APAP
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 70.5		$ 70.5			$ 70.5
Finite-Lived Intangible Asset, Useful Life	20 years 6 months
APAP | Finite-Lived Intangible Assets
Schedule of Intangible Asset by Major Class [Line Items]
Discount Rate, Present Value of Future Cash Flows	13.00%		13.00%			13.00%
Generics IPR&D
Schedule of Intangible Asset by Major Class [Line Items]
Non-Amortizable intangible assets, gross	$ 128.5		$ 128.5			$ 128.5
Generics IPR&D | Indefinite-lived Intangible Assets
Schedule of Intangible Asset by Major Class [Line Items]
Discount Rate, Present Value of Future Cash Flows	14.00%		14.00%			14.00%