Condensed Consolidated Statements of Cash Flows $ in Millions	9 Months Ended
	Sep. 27, 2024 USD ($)	Sep. 29, 2023 USD ($)	Dec. 30, 2022 USD ($)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ (0.6)	$ (1.7)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	135.6	(14.7)
Depreciation and amortization	93.5	423.2
Deferred income taxes	22.9	475.5
Reorganization Items, non-cash	0.0	1,294.1
(Amortization) accretion expense on debt premium/discount and settlement obligation	(3.6)	176.7
Other Noncash Income (Expense)	(18.9)	(11.6)
Increase (Decrease) in Accounts Receivable	16.5	23.8
Increase (Decrease) in Inventories	(222.1)	(99.1)
Accounts payable	(5.6)	(31.2)
Income taxes	(7.1)	168.7
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(13.6)	46.8
Net Cash Provided by (Used in) Operating Activities	185.7	(297.7)
Payments to Acquire Property, Plant, and Equipment	71.5	41.9
Payments for (Proceeds from) Other Investing Activities	(4.2)	(1.1)
Net Cash Provided by (Used in) Investing Activities	(44.7)	(40.8)
Issuance of external debt	0.0	380.0
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security	4.4	52.0
Debt financing costs	0.0	(2.4)
Net Cash Provided by (Used in) Financing Activities	(4.8)	325.5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	132.6	(14.7)
Cash and cash equivalents	410.5	389.8
Restricted Cash and Investments, Current	23.9	22.9
Restricted Cash and Investments, Noncurrent	41.6	39.3
Adjustments to reconcile net cash from operating activities:
Depreciation and amortization	93.5	423.2
Deferred income taxes	22.9	475.5
Other non-cash items	18.9	11.6
Non-cash impairment charges	0.0	135.9
Opioid-Related Litigation Settlement liability	0.0	(250.0)
Changes in assets and liabilities:
Accounts receivable, net	(16.5)	(23.8)
Inventories	222.1	99.1
Accounts payable	(5.6)	(31.2)
Income taxes	(7.1)	168.7
Other	13.6	(46.8)
Net Cash Provided by (Used in) Operating Activities	185.7	(297.7)
Cash Flows From Investing Activities:
Capital expenditures	(71.5)	(41.9)
Other	4.2	1.1
Net Cash From Investing Activities	(44.7)	(40.8)
Cash Flows From Financing Activities:
Repayment of debt	(4.4)	(52.0)
Net Cash Provided From Financing Activities	(4.8)	325.5
Net change in cash, cash equivalents and restricted cash, including cash classified within assets held for sale	132.6	(14.7)
Disposal Group, Including Discontinued Operations, Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(3.0)	0.0
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance	476.0	452.0	$ 466.7
Cash and cash equivalents, end of period	410.5	389.8
Proceeds from Sale of Restricted Investments	22.6	0.0
Acthar Gel-Related Litigation Settlement liability	(21.4)	(16.5)
Other	(0.4)	(0.1)
Retained Earnings (Deficit)
Net loss	(134.9)	(2,721.9)
Cash Flows From Operating Activities:
Net loss	(134.9)	(2,721.9)
Additional Paid-In Capital
Share-based compensation	3.8	7.7
Adjustments to reconcile net cash from operating activities:
Share-based compensation	$ 3.8	$ 7.7