Goodwill and Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended		11 Months Ended	12 Months Ended
	Dec. 29, 2023	Dec. 30, 2022	Jun. 16, 2022	Nov. 14, 2023	Dec. 31, 2021
Schedule of Intangible Asset by Major Class [Line Items]
Other Asset Impairment Charges	$ 2.6	$ 0.0	$ 0.0	$ 135.9	$ 154.9
Intangible asset amortization	16.2	318.7	281.8	449.6	581.1
Amortizable:
Finite-lived intangible assets, gross				624.6
Non-Amortizable:
Asset Impairment Charges	3.8	0.0	$ 0.0	179.9	$ 154.9
In-process research and development
Non-Amortizable:
Indefinite-lived intangible assets, gross	0.0	121.3
Completed Technology
Amortizable:
Finite-lived intangible assets, gross	624.6	3,041.2
Accumulated amortization	$ 16.2	$ 318.7
Acthar Gel
Amortizable:
Finite-lived intangible assets, gross				$ 110.0
Non-Amortizable:
Finite-lived intangible assets - useful lives				10 years
Acthar Gel | Finite-Lived Intangible Assets
Non-Amortizable:
Discount Rate, Present Value of Future Cash Flows				52.30%
Therakos
Amortizable:
Finite-lived intangible assets, gross				$ 129.4
Non-Amortizable:
Finite-lived intangible assets - useful lives				9 years
Therakos | Finite-Lived Intangible Assets
Non-Amortizable:
Discount Rate, Present Value of Future Cash Flows				51.50%
Amitiza
Amortizable:
Finite-lived intangible assets, gross				$ 12.3
Non-Amortizable:
Finite-lived intangible assets - useful lives				1 year
Amitiza | Finite-Lived Intangible Assets
Non-Amortizable:
Discount Rate, Present Value of Future Cash Flows				51.50%
Inomax
Amortizable:
Finite-lived intangible assets, gross				$ 41.3
Non-Amortizable:
Finite-lived intangible assets - useful lives				8 years
Inomax | Finite-Lived Intangible Assets
Non-Amortizable:
Discount Rate, Present Value of Future Cash Flows				51.50%
Generics
Amortizable:
Finite-lived intangible assets, gross				$ 186.7
Non-Amortizable:
Finite-lived intangible assets - useful lives				18 years
Generics | Finite-Lived Intangible Assets
Non-Amortizable:
Discount Rate, Present Value of Future Cash Flows				14.10%
APAP
Amortizable:
Finite-lived intangible assets, gross				$ 76.8
Non-Amortizable:
Finite-lived intangible assets - useful lives				20 years
APAP | Finite-Lived Intangible Assets
Non-Amortizable:
Discount Rate, Present Value of Future Cash Flows				13.50%
Terlivaz
Amortizable:
Finite-lived intangible assets, gross				$ 68.1
Non-Amortizable:
Finite-lived intangible assets - useful lives				5 years 6 months
Terlivaz | Finite-Lived Intangible Assets
Non-Amortizable:
Discount Rate, Present Value of Future Cash Flows				52.50%