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Financial Instruments and Fair Value Measurements
6 Months Ended
Jun. 26, 2020
Fair Value Disclosures [Abstract]  
Financial Instruments and Fair Value Measurements
12.Financial Instruments and Fair Value Measurements
Fair value is defined as the exit price that would be received from the sale of an asset or paid to transfer a liability, using assumptions that market participants would use in pricing an asset or liability. The fair value guidance establishes a three-level fair value hierarchy, which maximizes the use of observable inputs and minimizes the use of unobservable inputs used in measuring fair value. The levels within the hierarchy are as follows:

Level 1— observable inputs such as quoted prices in active markets for identical assets or liabilities;
Level 2— significant other observable inputs that are observable either directly or indirectly; and
Level 3— significant unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions.
The following tables provide a summary of the significant assets and liabilities that are measured at fair value on a recurring basis at the end of each period:

June 26,
2020
Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Assets:
Debt and equity securities held in rabbi trusts
$30.9  $21.0  $9.9  $—  
Equity securities
28.2  28.2  —  —  
$59.1  $49.2  $9.9  $—  

Liabilities:
Deferred compensation liabilities
$29.6  $—  $29.6  $—  
Contingent consideration and acquired contingent liabilities
39.1  —  —  39.1  
Settlement Warrants35.1  —  —  35.1  

$103.8  $—  $29.6  $74.2  
December 27,
2019
Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Assets:
Debt and equity securities held in rabbi trusts
$30.6  $21.0  $9.6  $—  
Equity securities
26.2  26.2  —  —  
$56.8  $47.2  $9.6  $—  
Liabilities:
Deferred compensation liabilities
$39.2  $—  $39.2  $—  
Contingent consideration and acquired contingent liabilities
69.3  —  —  69.3  
Settlement Warrants43.4  —  —  43.4  
$151.9  $—  $39.2  $112.7  

Debt and equity securities held in rabbi trusts. Debt securities held in rabbi trusts primarily consist of U.S. government and agency securities and corporate bonds. When quoted prices are available in an active market, the investments are classified as level 1. When quoted market prices for a security are not available in an active market, they are classified as level 2. Equity securities held in rabbi trusts primarily consist of U.S. common stocks, which are valued using quoted market prices reported on nationally recognized securities exchanges.
Equity securities. Equity securities consist of shares in Silence Therapeutics plc, for which quoted prices are available in an active market; therefore, the investment is classified as level 1 and is valued based on quot aed market prices reported on an internationally recognized securities exchange.
Deferred compensation liabilities. The Company maintains a non-qualified deferred compensation plan in the U.S., which permits eligible employees of the Company to defer a portion of their compensation. A recordkeeping account is set up for each participant and the participant chooses from a variety of funds for the deemed investment of their accounts. The recordkeeping accounts generally correspond to the funds offered in the Company's U.S. tax-qualified defined contribution retirement plan and the account balance fluctuates with the investment returns on those funds.
Contingent consideration and acquired contingent liabilities. As of June 26, 2020, the Company maintains various contingent consideration and acquired contingent liabilities associated with the acquisitions of Questcor, Stratatech Corporation ("Stratatech"), and Ocera Therapeutics, Inc. ("Ocera").
The contingent liability associated with the acquisition of Questcor pertains to the Company's license agreement with Novartis AG and Novartis Pharma AG (collectively "Novartis") related to Synacthen, otherwise known as the Company's development product MNK-1411. Under the terms of this agreement, the Company made a $25.0 million payment during the six months ended June 26, 2020 and subsequently suspended its rights and obligations to Novartis under such agreement. As of June 26, 2020 there are no further contingent liabilities associated with Synacthen. The Company determined the fair value of the contingent consideration associated with the acquisition of Questcor to be zero and $24.5 million as of June 26, 2020 and December 27, 2019, respectively.
As part of the acquisition of Stratatech, the Company provided contingent consideration to the prior shareholders of Stratatech, primarily in the form of regulatory filing and approval milestones associated with the deep partial thickness and full thickness indications associated with StrataGraft®. For each indication, the Company is responsible for a payment upon acceptance of the Company's submission and another upon approval by the FDA. The Company assesses the likelihood and timing of making such payments at each balance sheet date. The fair value of the contingent payments was measured based on the net present value of a probability-weighted assessment. The Company determined the fair value of the contingent consideration associated with the acquisition of Stratatech to be $30.1 million and $29.0 million as of June 26, 2020 and December 27, 2019, respectively.
As part of the acquisition of Ocera, the Company provided contingent consideration to the prior shareholders of Ocera in the form of both patient enrollment clinical study milestones and sales-based milestones associated with MNK-6105 and MNK-6106. The Company determined the fair value of the contingent consideration based on an option pricing model to be $9.0 million and $15.8 million as of June 26, 2020 and December 27, 2019, respectively.
Of the total fair value of the contingent consideration of $39.1 million, $34.1 million was classified as current and $5.0 million was classified as non-current in the unaudited condensed consolidated balance sheet as of June 26, 2020. The following table summarizes the activity for contingent consideration:
Balance as of December 27, 2019$69.3  
Payments
(25.0) 
Accretion expense
0.5  
Fair value adjustments
(5.7) 
Balance as of June 26, 2020$39.1  
Settlement Warrants. Under the Opioid-Related Litigation Settlement, as it was structured when initially agreed, the Company would issue Settlement Warrants upon emergence from the contemplated Chapter 11 process to the Opioid Claimant Trust to purchase ordinary shares of the Company with an eight year term at a strike price of $3.15 per ordinary share that would represent approximately 19.99% of the Company's fully diluted outstanding shares, including after giving effect to the exercise of the warrants, provided that such warrants may not be exercised during any calendar quarter in a quantity that would exceed 5.0% of the number of shares outstanding.
The fair value of the Settlement Warrants has been estimated using the Black-Scholes pricing model. Use of a valuation model requires management to make certain assumptions with respect to selected model inputs. The expected volatility assumption is based on the historical and implied volatility of the Company's peer group with similar business models. The expected term assumption is based on the contractual term of the Settlement Warrants, including the maximum exercise restriction of 5.0% per calendar quarter, which resulted in the valuation of four separate tranches. The expected annual dividend per share is based on the Company's current intentions regarding payment of cash dividends. The risk-free interest rate is based on U.S. Treasury zero-coupon issues with a remaining term equal to the expected term assumed. The estimated fair value for the Settlement Warrants will be subject to revaluation at each balance sheet date with any changes in fair value recorded as a non-cash gain or (loss) in the unaudited condensed consolidated statements of operations until the Settlement Warrants are issued, at which point they will be recorded as equity or as a liability based upon the facts and circumstances at the time of issuance.
The key assumptions used to estimate the fair value of the Settlement Warrants were as follows:
June 26,
2020
December 27, 2019
Expected share price volatility63.1 %54.4 %
Weighted-average risk-free rate0.5 %1.8 %
Expected annual dividend per share— %— %
Weighted-average expected term (in years)7.67.6
Share price$2.77  $3.45  

Financial Instruments Not Measured at Fair Value
        The following methods and assumptions were used by the Company in estimating fair values for financial instruments not measured at fair value as of June 26, 2020 and December 27, 2019:
The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and the majority of other current assets and liabilities approximate fair value because of their short-term nature. The Company classifies cash on hand and deposits in banks, including commercial paper, money market accounts and other investments it may hold from time to time, with an original maturity of three months or less, as cash and cash equivalents (level 1). The fair value of restricted cash was equivalent to its carrying value of $41.4 million and $31.7 million as of June 26, 2020 and December 27, 2019, (level 1), respectively, which was included in other assets on the unaudited condensed consolidated balance sheets.
The Company has received a portion of consideration as part of contingent earn-out payments related to the sale of the Nuclear Imaging business in the form of preferred equity certificates. These securities are classified as held-to-maturity and are carried at amortized cost, which approximates fair value (level 3), of $29.8 million and $18.9 million as of June 26, 2020 and December 27, 2019, respectively. These securities are included in other assets on the unaudited condensed consolidated balance sheets.
The Company's life insurance contracts are carried at cash surrender value, which is based on the present value of future cash flows under the terms of the contracts (level 3). Significant assumptions used in determining the cash surrender value include the amount and timing of future cash flows, interest rates and mortality charges. The fair value of these contracts approximates the carrying value of $51.5 million and $51.1 million as of June 26, 2020 and December 27, 2019, respectively. These contracts are included in other assets on the unaudited condensed consolidated balance sheets.
The carrying value of the Company's revolving credit facility approximates the fair value due to the short-term nature of this instrument, and is therefore classified as level 1. The Company's 4.875%, 5.75%, 4.75%, 5.625%, 5.50% and first and second lien 10.00% senior notes are classified as level 1, as quoted prices are available in an active market for these notes. Since the quoted market prices for the Company's term loans and 9.50% and 8.00% debentures are not available in an active market, they are classified as level 2 for purposes of developing an estimate of fair value. The following table presents the carrying values and estimated fair values of the Company's debt as of the end of each period:
June 26, 2020December 27, 2019
Carrying
Value
Fair
Value
Carrying
Value
Fair
Value
Level 1:
4.875% senior notes due April 2020$—  $—  $614.8  $480.0  
5.75% senior notes due August 2022610.3  149.6  610.3  251.0  
4.75% senior notes due April 2023133.7  20.2  133.7  53.7  
5.625% senior notes due October 2023514.7  100.4  514.7  193.2  
5.50% senior notes due April 2025387.2  59.5  387.2  135.5  
10.00% first lien senior notes due April 2025495.0  420.2  —  —  
10.00% second lien senior notes due April 2025322.9  194.5  322.9  253.8  
Revolving credit facility900.0  900.0  900.0  900.0  
Level 2:
9.50% debentures due May 202210.4  3.6  10.4  5.4  
8.00% debentures due March 20234.4  1.1  4.4  2.0  
Term loan due September 20241,513.0  1,121.3  1,520.8  1,240.0  
Term loan due February 2025401.5  296.7  403.6  326.2  
Total Debt$5,293.1  $3,267.1  $5,422.8  $3,840.8  

Concentration of Credit and Other Risks
Financial instruments that potentially subject the Company to concentrations of credit risk primarily consist of accounts receivable. The Company generally does not require collateral from customers. A portion of the Company's accounts receivable outside the U.S. includes sales to government-owned or supported healthcare systems in several countries, which are subject to payment delays. Payment is dependent upon the financial stability and creditworthiness of those countries' national economies.
The following table shows net sales attributable to distributors that accounted for 10.0% or more of the Company's total segment net sales, which excludes the one-time charge related to the Medicaid lawsuit:
Three Months EndedSix Months Ended
June 26,
2020
June 28,
2019
June 26,
2020
June 28,
2019
CuraScript, Inc.
30.2 %31.9 %27.5 %29.8 %
The following table shows accounts receivable attributable to distributors that accounted for 10.0% or more of the Company's gross accounts receivable at the end of each period:
June 26,
2020
December 27,
2019
AmerisourceBergen Corporation
27.1 %31.3 %
McKesson Corporation
17.1  15.3  
CuraScript, Inc.
11.5  12.1  

The following table shows net sales attributable to products that accounted for 10.0% or more of the Company's total segment net sales, which excludes the one-time charge related to the Medicaid lawsuit:
Three Months EndedSix Months Ended
June 26,
2020
June 28,
2019
June 26,
2020
June 28,
2019
Acthar Gel30.5 %32.4 %27.9 %30.4 %
INOmax22.1  17.0  21.7  18.0  
Ofirmev*11.0  *11.5