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Fresh-Start Accounting - Reorganization Adjustments (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended 11 Months Ended 12 Months Ended
Nov. 14, 2023
Jun. 16, 2022
Dec. 29, 2023
Dec. 30, 2022
Jun. 16, 2022
Nov. 14, 2023
Dec. 30, 2022
Dec. 31, 2021
Jun. 30, 2023
Jun. 16, 2023
Dec. 25, 2020
Reorganization, Chapter 11 [Line Items]                      
Cash and cash equivalents $ 186.7 $ 297.9 $ 262.7 $ 409.5 $ 297.9 $ 186.7 $ 409.5 $ 1,345.0      
Debt instrument, face amount     1,647.8 3,534.1     3,534.1        
Issuance of external debt   650.0 0.0 0.0 650.0 380.0   0.0      
Opioid-Related Settlement, Emergence Payment   447.4     447.4            
Opioid-Related Settlement, Gross Amount of Deferred Payment   1,275.0     1,275.0            
Opioid-Related Litigation Settlement liability     0.0 200.0     200.0        
Opioid-Related Litigation Settlement liability     0.0 379.9     379.9        
Stock Issued During Period, Value, New Issues         2,189.7 1,169.7          
Adjustments to Additional Paid in Capital, Warrant Issued         (13.9) (25.1)          
Shareholders' equity $ 1,194.8 2,203.6 $ 1,160.2 $ 1,613.7 2,203.6 1,194.8 $ 1,613.7 313.4     $ 1,019.2
Share Price                 $ 1.18    
Adjustments to Retained Deficit, Prepaid Success Fee   $ (10.9)     (10.9)            
Cancellation of Predecessor equity         $ (0.5) $ 9.2          
Operating Lease, Weighted Average Discount Rate, Percent     8.10% 11.90%     11.90%        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 99.36 $ 103.40     $ 103.40 $ 99.36          
Debtor Reorganization Items, Gain (Loss) on Settlement of Other Claims, Net     $ 0.0 $ 0.0 $ 5.4 $ 1,139.5   (0.5)      
Debtor Reorganization Items, Write-off of Debt Issuance Costs and Debt Discounts     0.0 0.0 0.0 21.2   23.1      
Acthar Gel-Related Settlement, total obligation   $ 260.0 236.1   260.0            
Acthar Gel-Related Settlement liability     $ 128.5 $ 75.0     $ 75.0        
Ordinary shares, par value (in usd per share)     $ 0.01 $ 0.01     $ 0.01        
Cash Paid, Reorganization items     $ 0.8 $ 18.4 304.1 22.6 $ 333.1        
Ordinary Shares                      
Reorganization, Chapter 11 [Line Items]                      
Stock Issued During Period, Value, New Issues         0.1 0.2          
Shareholders' equity $ 0.2 $ 0.1 $ 0.2 0.1 0.1 0.2 0.1 18.9     $ 18.8
Cancellation of Predecessor equity         $ (18.9) $ (0.1)          
Successor                      
Reorganization, Chapter 11 [Line Items]                      
Ordinary shares, par value (in usd per share)   $ 0.01     $ 0.01            
Ordinary shares, shares issued (in shares) 19,696,335 13,170,932     13,170,932 19,696,335          
Common Stock, Shares, Outstanding 19,696,335   19,696,335     19,696,335          
StrataGraft PRV                      
Reorganization, Chapter 11 [Line Items]                      
Other Indefinite-lived Intangible Assets   $ 100.0     $ 100.0            
Opioid Claimant Trust [Member]                      
Reorganization, Chapter 11 [Line Items]                      
Opioid-related Settlement   1,725.0     1,725.0            
Acthar Gel-Related Settlement                      
Reorganization, Chapter 11 [Line Items]                      
Debtor Reorganization Items, Gain (Loss) on Settlement of Other Claims, Net           $ 145.0          
Opioid-related litigation settlement liability                      
Reorganization, Chapter 11 [Line Items]                      
Debtor Reorganization Items, Gain (Loss) on Settlement of Other Claims, Net           598.4          
Accretion of Debt Discount                      
Reorganization, Chapter 11 [Line Items]                      
Debtor Reorganization Items, Gain (Loss) on Settlement of Other Claims, Net           377.6          
Receivables Financing Facility                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   200.0 $ 0.0 0.0 200.0   0.0        
Debt Issuance Costs, Gross $ 1.7         1.7          
Long-Term Debt 98.7         98.7          
Ten Point Zero Percent Second Lien Notes due 2029                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount     0.0 328.3     328.3        
Ten Point Zero Percent First Lien Notes [Member]                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   495.0 0.0 495.0 495.0   495.0        
Eleven Point Five Percent First Lien Senior Secured Notes                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount     0.0 650.0     650.0        
Debtor Reorganization Items, Write-off of Debt Issuance Costs and Debt Discounts           18.5          
2017 Replacement Term Loan                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   1,392.9 0.0 1,374.1 1,392.9   1,374.1        
2018 Replacement Term Loan                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   369.7 0.0 364.8 369.7   364.8        
Ten Point Zero Percent Second Lien Notes (New 2L Notes)                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount     0.0 321.9     321.9        
Debtor-in-Possession Financing                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount 280.0         280.0          
First-Out Takeback Term Loan Due November 2028                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount 229.4   228.8 0.0   229.4 0.0        
Second-Out Takeback Term Loan Due November 2028                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount 642.0   640.4 0.0   642.0 0.0        
Fourteen Point Seven Five Percent Second-Out Takeback Notes                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount 778.6   778.6 0.0   778.6 $ 0.0        
Ten Point Zero Percent Second Lien Notes (Existing Notes)                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   322.9     322.9            
Ten Point Zero Percent First Lien Notes Due April 2025                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   495.0     495.0            
Takeback Term Loans                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount 871.4         871.4          
Reorganization, Chapter 11, Plan Effect Adjustment                      
Reorganization, Chapter 11 [Line Items]                      
Proceeds from Debt, Net of Issuance Costs   637.0                  
Payment for Debt Extinguishment or Debt Prepayment Cost   900.0                  
Upfront Payment of the Opioid-Related Litigation Settlement   (447.4)                  
Upfront Payment of the Acthar Gel-Related Settlement   (17.8)                  
Payment of Administrative, Priority and Trade Claims   (26.2)                  
Payment of Professional Fees (19.4) 43.5                  
Payment to Fund Professional Fees Escrow 24.0 (89.0)                  
Payment of General Unsecured Claims   (135.0)                  
Payment of Noteholder Consent Fees   (19.3)                  
Payments for Other Fees 33.3 (53.5)                  
Payment of cash sweep 50.6                    
Reorganization Adjustments, Cashed Used 127.3 (1,731.7)                  
Cash and cash equivalents (127.3) (1,094.7)     (1,094.7) (127.3)       $ (1,094.7)  
Restricted Cash 24.0 89.0     89.0 24.0          
Prepaid Expense, Reorganization Adjustment   10.9                  
Other Assets, Reorganization Adjustment 2.4 6.5                  
Payments for Cure and Standard, Administrative and Priority Payments   25.2     25.2            
Payables due to Professional Advisor Success Fees   14.6     14.6            
Acthar Gel-Related Settlement, Current 21.4 16.5     16.5 21.4          
Opioid-Related Litigation Settlement liability   200.0     200.0            
Opioid-Related Litigation Settlement liability   304.3     304.3            
Contingent consideration   (41.8)     (41.8)            
Liabilities Subject to Compromise 4,932.1 6,402.7     6,402.7 4,932.1          
Liabilities, Reinstated (236.2) (59.8)     (59.8) (236.2)          
Stock Issued During Period, Value, New Issues (1,169.7) (2,189.7)                  
Adjustments to Additional Paid in Capital, Warrant Issued (25.1) (13.9)                  
Issuance of Takeback 2L Notes   (190.2)     (190.2)            
Cash payments to settle amounts per the Plan   (601.3)     (601.3)            
Total consideration provided to settle amounts per the Plan (2,729.9) (5,399.2)     (5,399.2) (2,729.9)          
Gain on settlement of liabilities subject to compromise 1,966.0 943.7 0.0 0.0 (943.7) (1,966.0)   0.0      
Additional Paid in Capital, Common Stock 1,169.5 2,189.6     2,189.6 1,169.5          
Shareholders' equity $ 3,682.2 $ 2,927.2     $ 2,927.2 $ 3,682.2          
Share Price $ 60.28 $ 18.50     $ 18.50 $ 60.28          
Volatility, Black Scholes Model, Warrants 65.00% 62.28%     62.28% 65.00%          
Adjustment to Retained Deficit, Professional, Success and Exit Fees $ (24.0) $ (91.6)     $ (91.6) $ (24.0)          
Adjustments to Retained Deficit, Prepaid Insurance (20.0) (9.2)     (9.2) (20.0)          
Adjustments to Retained Deficit, Fair Value of First-Out Takeback Term Loans and Related Embedded Derivative (21.2)         (21.2)          
Adjustment to Retained Deficit, Severance Accrual   (5.7)     (5.7)            
Adjustment to Retained Deficit, Income Tax Expense on Plan Adjustments 585.9 (102.7)     (102.7) 585.9          
Cancellation of Predecessor equity 2,199.9 4,002.3                  
Reorganization Adjustments to Retained Deficit $ 4,686.6 $ 4,725.9     $ 4,725.9 $ 4,686.6          
Risk-Free Interest Rate, Black Scholes Model, Warrants 4.49% 3.34%     3.34% 4.49%          
Derivative Liability, Current $ 7.6         $ 7.6          
Derivative Liability, Noncurrent 7.5         7.5          
Acthar Gel-Related Settlement liability 214.7 $ 63.2     $ 63.2 214.7          
Ordinary shares, shares issued (in shares)   13,170,932     13,170,932            
Reorganization, Chapter 11, Plan Effect Adjustment | Ordinary Shares                      
Reorganization, Chapter 11 [Line Items]                      
Stock Issued During Period, Value, New Issues 0.2 $ 0.1                  
Reorganization, Chapter 11, Plan Effect Adjustment | StrataGraft PRV | General Unsecured Claims Trust                      
Reorganization, Chapter 11 [Line Items]                      
Contingent consideration   35.0     $ 35.0            
Reorganization, Chapter 11, Plan Effect Adjustment | StrataGraft CVR                      
Reorganization, Chapter 11 [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability 14.9 6.8     6.8 14.9          
Reorganization, Chapter 11, Plan Effect Adjustment | Other current liabilities                      
Reorganization, Chapter 11 [Line Items]                      
Restructuring Reserve   5.7     5.7            
Reinstatement of various successor obligations from LSTC   15.4     15.4            
Accrued and Other Current Liabilities, Reorganization Adjustment   29.7     29.7            
Accrued and Other Current Liabilities, Reorganization Adjustment   50.8     50.8            
Asbestos-related defense cost accrual   16.8     16.8            
Reorganization, Chapter 11, Plan Effect Adjustment | Accounts Payable                      
Reorganization, Chapter 11 [Line Items]                      
Liabilities Subject to Compromise   (17.7)     (17.7)            
Liabilities, Reinstated   (0.1)     (0.1)            
Reorganization, Chapter 11, Plan Effect Adjustment | Interest Payable, Current                      
Reorganization, Chapter 11 [Line Items]                      
Liabilities Subject to Compromise (158.8) (35.2)     (35.2) (158.8)          
Reorganization, Chapter 11, Plan Effect Adjustment | Long-term Debt [Member]                      
Reorganization, Chapter 11 [Line Items]                      
Liabilities Subject to Compromise (3,512.1) (3,746.2)     (3,746.2) (3,512.1)          
Liabilities, Reinstated (1,535.1) (1,778.3)     (1,778.3) (1,535.1)          
Reorganization, Chapter 11, Plan Effect Adjustment | Accrued Environmental Loss Contingencies                      
Reorganization, Chapter 11 [Line Items]                      
Liabilities Subject to Compromise   (67.2)     (67.2)            
Reorganization, Chapter 11, Plan Effect Adjustment | Acthar Gel-Related Settlement                      
Reorganization, Chapter 11 [Line Items]                      
Liabilities Subject to Compromise (236.1) (630.0)     (630.0) (236.1)          
Liabilities, Reinstated   (79.7)     (79.7)            
Reorganization, Chapter 11, Plan Effect Adjustment | Opioid-related litigation settlement liability                      
Reorganization, Chapter 11 [Line Items]                      
Liabilities Subject to Compromise (1,025.0) (1,722.4)     (1,722.4) (1,025.0)          
Liabilities, Reinstated   (504.3)     (504.3)            
Reorganization, Chapter 11, Plan Effect Adjustment | Other Liabilities                      
Reorganization, Chapter 11 [Line Items]                      
Liabilities Subject to Compromise (0.1) (151.6)     (151.6) (0.1)          
Liabilities, Reinstated (236.1) (27.3)     (27.3) (236.1)          
Reorganization, Chapter 11, Plan Effect Adjustment | Liability, Defined Benefit Plan, Noncurrent                      
Reorganization, Chapter 11 [Line Items]                      
Liabilities Subject to Compromise   (32.4)     (32.4)            
Liabilities, Reinstated (0.1) (32.4)     (32.4) (0.1)          
Reorganization, Chapter 11, Plan Effect Adjustment | Medicaid Lawsuit [Member]                      
Reorganization, Chapter 11 [Line Items]                      
Acthar Gel-Related Settlement, Gross Amount of Deferred Payments   $ 245.0     $ 245.0            
Discount Rate, Present Value of Future Cash Flows   27.80%     27.80%            
Acthar Gel-Related Settlement, Emergence Payment, net of Interest   $ 17.8     $ 17.8            
Reorganization, Chapter 11, Plan Effect Adjustment | Opioid Claimant Trust [Member]                      
Reorganization, Chapter 11 [Line Items]                      
Opioid-related Settlement   $ 1,725.0     $ 1,725.0            
Reorganization, Chapter 11, Plan Effect Adjustment | Opioid-related litigation settlement liability                      
Reorganization, Chapter 11 [Line Items]                      
Discount Rate, Present Value of Future Cash Flows   27.80%     27.80%            
Reorganization, Chapter 11, Plan Effect Adjustment | Insurance Policy Write-off                      
Reorganization, Chapter 11 [Line Items]                      
Prepaid Expense, Reorganization Adjustment 17.2                    
Reorganization, Chapter 11, Plan Effect Adjustment | Directors Compensation Write-off                      
Reorganization, Chapter 11 [Line Items]                      
Prepaid Expense, Reorganization Adjustment 0.4                    
Reorganization, Chapter 11, Plan Effect Adjustment | Receivables Financing Facility                      
Reorganization, Chapter 11 [Line Items]                      
Payments of Debt Issuance Costs   $ 2.6                  
Reorganization, Chapter 11, Plan Effect Adjustment | 2017 and 2018 Replacement Term Loan                      
Reorganization, Chapter 11 [Line Items]                      
Debt, Current   34.7     $ 34.7            
Reorganization, Chapter 11, Plan Effect Adjustment | Ten Point Zero Percent Second Lien Notes due 2029                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   375.0     375.0            
Reorganization Plan Adjustment   (184.8)     (184.8)            
Reorganization, Chapter 11, Plan Effect Adjustment | Ten Point Zero Percent First Lien Notes [Member]                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   495.0     495.0            
Debt Issuance Costs, Gross   5.1     5.1            
Reorganization, Chapter 11, Plan Effect Adjustment | Eleven Point Five Percent First Lien Senior Secured Notes                      
Reorganization, Chapter 11 [Line Items]                      
Issuance of external debt   650.0                  
Reorganization, Chapter 11, Plan Effect Adjustment | Eleven Point Five Percent First Lien Senior Secured Notes | Original Issuance Discount                      
Reorganization, Chapter 11 [Line Items]                      
Debt Issuance Costs, Gross   13.0     13.0            
Reorganization, Chapter 11, Plan Effect Adjustment | Eleven Point Five Percent First Lien Senior Secured Notes | Deferred Debt Issuance Costs                      
Reorganization, Chapter 11 [Line Items]                      
Debt Issuance Costs, Gross   9.7     9.7            
Reorganization, Chapter 11, Plan Effect Adjustment | 2017 Replacement Term Loan                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   1,392.9     1,392.9            
Reorganization Plan Adjustment   (169.4)     (169.4)            
Reorganization, Chapter 11, Plan Effect Adjustment | 2018 Replacement Term Loan                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   369.7     369.7            
Reorganization Plan Adjustment   (42.2)     (42.2)            
Reorganization, Chapter 11, Plan Effect Adjustment | Ten Point Zero Percent Second Lien Notes (New 2L Notes)                      
Reorganization, Chapter 11 [Line Items]                      
Reorganization Plan Adjustment   (95.7)     (95.7)            
Reorganization, Chapter 11, Plan Effect Adjustment | Debt                      
Reorganization, Chapter 11 [Line Items]                      
Reorganization Plan Adjustment   (492.1)     (492.1)            
Reorganization, Chapter 11, Plan Effect Adjustment | First-Out Takeback Term Loan Due November 2028                      
Reorganization, Chapter 11 [Line Items]                      
Reorganization Plan Adjustment 15.0         15.0          
Reorganization, Chapter 11, Plan Effect Adjustment | Second-Out Takeback Term Loan Due November 2028                      
Reorganization, Chapter 11 [Line Items]                      
Reorganization Plan Adjustment 46.3         46.3          
Reorganization, Chapter 11, Plan Effect Adjustment | Fourteen Point Seven Five Percent Second-Out Takeback Notes                      
Reorganization, Chapter 11 [Line Items]                      
Reorganization Plan Adjustment 59.3         59.3          
Reorganization, Chapter 11, Plan Effect Adjustment | Secured Debt                      
Reorganization, Chapter 11 [Line Items]                      
Reorganization Plan Adjustment 120.6         120.6          
Reorganization, Chapter 11, Plan Effect Adjustment | Ten Point Zero Percent Second Lien Notes (Existing Notes)                      
Reorganization, Chapter 11 [Line Items]                      
Debt instrument, face amount   322.9     322.9            
Reorganization, Chapter11, Post Adjustment, Successor                      
Reorganization, Chapter 11 [Line Items]                      
Cash and cash equivalents 186.8 297.9     297.9 186.8          
Acthar Gel-Related Settlement, Current 21.4 16.5     16.5 21.4          
Opioid-Related Litigation Settlement liability   200.0     200.0            
Opioid-Related Litigation Settlement liability   304.3     304.3            
Liabilities Subject to Compromise 0.0 0.0     0.0 0.0          
Shareholders' equity 1,194.8 2,203.6     2,203.6 1,194.8          
Acthar Gel-Related Settlement liability 126.1 63.2     63.2 126.1          
Preferred Stock, Value, Outstanding   0.0     0.0            
Reorganization, Chapter 11, Fresh-Start Adjustment                      
Reorganization, Chapter 11 [Line Items]                      
Cash and cash equivalents 0.0 0.0     0.0 0.0          
Acthar Gel-Related Settlement, Current 0.0 0.0     0.0 0.0          
Opioid-Related Litigation Settlement liability   0.0     0.0            
Opioid-Related Litigation Settlement liability   0.0     0.0            
Liabilities Subject to Compromise 0.0 0.0     0.0 0.0          
Shareholders' equity $ (1,243.6) (772.5)     (772.5) $ (1,243.6)          
Fresh-Start Adjustment, Spare Parts   3.9     3.9            
Fresh-Start Adjustments, Debt Issuance Costs   1.1     1.1            
Fresh-Start Adjustments, Income Tax Receivables   $ 0.9     $ 0.9            
Operating Lease, Weighted Average Discount Rate, Percent 8.10% 11.83%     11.83% 8.10%          
Fresh-Start Adjustments, Right-of-Use Assets $ 12.5 $ 1.6     $ 1.6 $ 12.5          
Fresh-Start Adjustments, Asbestos-Related Defense Costs, Current   6.1     6.1            
Fresh-Start Adjustments, Asbestos-Related Defense Costs, Non-Current   16.7     16.7            
Fresh-Start Adjustments, Lease Liabilities   6.9     6.9            
Fresh-Start Adjustments, Unamortized Debt Issuance Costs   5.1     5.1            
Fresh-Start Adjustments, Debt, Fair Value   23.5     23.5            
Adjustment to Retained Deficit, Inventory 257.6 851.8     851.8 257.6          
Adjustment to Retained Deficit, Property, Plant and Equipment (150.2) (299.2)     (299.2) (150.2)          
Fresh-Start Adjustments, Intangible assets, net (1,633.7) (2,014.4)     (2,014.4) (1,633.7)          
Fresh-Start Adjustments, Acthar Gel-Related Settlement 88.6         88.6          
Adjustments to Retained Deficit, Current Asset Held for Sale   100.0     100.0            
Adjustment to Retained Deficit, Debt   18.4     18.4            
Adjustment to Retained Deficit, Other Assets and Liabilities (15.0) (11.2)     (11.2) (15.0)          
Reorganization Items, net, Loss on Fresh-Start Adjustments (1,452.7) (1,354.6) $ 0.0 $ 0.0 1,354.6 1,452.7   $ 0.0      
Fresh-Start Adjustments, Accumulated Other Comprehensive Income 11.1 (9.9)     (9.9) 11.1          
Fresh-Start Adjustments, Income Tax Benefit 209.1 582.1     582.1 209.1          
Fresh-Start Adjustment, Accumulated Retained Deficit (1,232.5) (782.4)     (782.4) (1,232.5)          
Fresh-Start Adjustment, Prepaid Income Taxes   54.0     54.0            
Fresh-Start Adjustments, Lease Liabilities, Current 0.1         0.1          
Fresh-Start Adjustments, Lease Liabilities, Noncurrent 12.7         12.7          
Acthar Gel-Related Settlement liability $ (88.6) 0.0     0.0 $ (88.6)          
Preferred Stock, Value, Outstanding   0.0     0.0            
Reorganization, Chapter 11, Fresh-Start Adjustment | Acthar Gel-Related Settlement | Minimum                      
Reorganization, Chapter 11 [Line Items]                      
Discount Rate, Present Value of Future Cash Flows 13.30%         13.30%          
Reorganization, Chapter 11, Fresh-Start Adjustment | Indemnification Receivable, Current                      
Reorganization, Chapter 11 [Line Items]                      
Change in Accounting Policy, Fresh-Start   $ 4.3     $ 4.3            
Reorganization, Chapter 11, Fresh-Start Adjustment | Finite-Lived Intangible Assets | Minimum                      
Reorganization, Chapter 11 [Line Items]                      
Discount Rate, Present Value of Future Cash Flows 13.50% 13.00%     13.00% 13.50%          
Reorganization, Chapter 11, Fresh-Start Adjustment | Finite-Lived Intangible Assets | Maximum                      
Reorganization, Chapter 11 [Line Items]                      
Discount Rate, Present Value of Future Cash Flows 52.50% 15.00%     15.00% 52.50%          
Reorganization, Chapter 11, Fresh-Start Adjustment | Indemnification Receivable, Non-Current                      
Reorganization, Chapter 11 [Line Items]                      
Change in Accounting Policy, Fresh-Start   $ 16.0     $ 16.0            
Reorganization, Chapter 11, Fresh-Start Adjustment | Accumulated Other Comprehensive (Loss) Income                      
Reorganization, Chapter 11 [Line Items]                      
Fresh-Start Adjustments, AOCI, Income Tax Effects $ 2.5 0.3     0.3 $ 2.5          
Fresh-Start Adjustments, AOCI, Pension Benefits 10.0 8.1     8.1 10.0          
Fresh-Start Adjustments, AOCI, CTA 2.1 2.1     2.1 2.1          
Fresh-Start Adjustments, AOCI, Derivatives 5.7         5.7          
Fresh-Start Adjustments, AOCI, Income Tax Benefit 0.0         0.0          
Reorganization, Chapter 11, Predecessor, before Adjustment                      
Reorganization, Chapter 11 [Line Items]                      
Cash and cash equivalents 314.1 1,392.6     1,392.6 314.1          
Acthar Gel-Related Settlement, Current 0.0 0.0     0.0 0.0          
Opioid-Related Litigation Settlement liability   0.0     0.0            
Opioid-Related Litigation Settlement liability   0.0     0.0            
Liabilities Subject to Compromise (4,932.1) (6,402.7)     (6,402.7) (4,932.1)          
Shareholders' equity $ (1,243.8) $ 48.9     $ 48.9 $ (1,243.8)          
Operating Lease, Weighted Average Discount Rate, Percent 13.20% 8.85%     8.85% 13.20%          
Acthar Gel-Related Settlement liability $ 0.0 $ 0.0     $ 0.0 $ 0.0          
Preferred Stock, Value, Outstanding   $ 0.0     $ 0.0