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Discontinued Operations and Disposal Groups (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 13, 2025
Mar. 28, 2025
Dec. 27, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Transaction Services Agreement Revenue   $ 3.0  
Mallinckrodt & Endo Merger      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Payments to Acquire Interest in Subsidiaries and Affiliates $ 80.0    
Mallinckrodt & Endo Merger | Mallinckrodt      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 50.10%    
Mallinckrodt & Endo Merger | Endo      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 49.90%    
Transaction Incentive Plan      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Participant Compensation, Paid After the Next Twelve Months   16.4  
Accrued Bonuses   4.4  
Compensation Expense, Excluding Cost of Good and Service Sold   1.7  
Therakos Divestiture      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from Divestiture of Businesses   $ 881.4 $ 887.6
Adverse Change in Recommendation | Mallinckrodt & Endo Merger | Mallinckrodt      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss on Contract Termination $ 80.2    
Adverse Change in Recommendation | Mallinckrodt & Endo Merger | Endo      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss on Contract Termination 83.0    
Shareholders Vote Failure | Mallinckrodt & Endo Merger | Mallinckrodt      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss on Contract Termination 30.8    
Shareholders Vote Failure | Mallinckrodt & Endo Merger | Endo      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss on Contract Termination $ 31.9