Goodwill and Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended			6 Months Ended	9 Months Ended
	Jun. 16, 2022	Sep. 30, 2022	Sep. 30, 2022	Sep. 24, 2021	Jun. 16, 2022	Sep. 24, 2021	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Non-restructuring impairment charges		$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 64.5
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 2,918.9	3,041.2	3,041.2		2,918.9		$ 10,601.8
Accumulated amortization		182.1	182.1				5,269.4
Intangible assets, net		2,980.4	2,980.4				5,448.4
Non-Amortizable intangible assets, gross	233.3	121.3	121.3		233.3		116.0
Intangible Assets, Gross (Excluding Goodwill)	3,152.2				3,152.2
Non-restructuring impairment charges		0.0	0.0	0.0	0.0	64.5
Amortization of Intangible Assets		$ 136.6	$ 182.1	$ 145.3	$ 281.8	$ 435.8
Loss from continuing operations		$ (21.61)	$ (26.44)	$ (3.18)	$ (3.70)	$ (6.13)
Reorganization, Chapter 11, Plan Effect Adjustment
Schedule of Intangible Asset by Major Class [Line Items]
Intangible assets, net	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
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		121.3	121.3				81.0
Completed Technology
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross		3,041.2	3,041.2				10,404.0
Accumulated amortization		182.1	182.1				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]
Non-Amortizable intangible assets, gross	$ 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%
StrataGraft [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 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%
Amitiza [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 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%
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					$ 21.7
Loss from continuing operations					$ 0.26
Acthar
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 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%
Therakos [Member]
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 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%
Inomax
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 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%
StrataGraft PRV
Schedule of Intangible Asset by Major Class [Line Items]
Other Indefinite-lived Intangible Assets	$ 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
Generics
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 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%
APAP
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross	$ 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%
Generics IPR&D
Schedule of Intangible Asset by Major Class [Line Items]
Non-Amortizable intangible assets, gross	$ 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%
Terlivaz
Schedule of Intangible Asset by Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years
Terlivaz | Completed Technology
Schedule of Intangible Asset by Major Class [Line Items]
Amortizable intangible assets, gross		$ 17.5	$ 17.5