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Financial Instruments and Fair Value Measurements
9 Months Ended
Sep. 24, 2021
Fair Value Disclosures [Abstract]  
Financial Instruments and Fair Value Measurements
13.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:

September 24,
2021
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
$37.9 $23.7 $14.2 $— 
Equity securities
37.3 37.3 — — 
$75.2 $61.0 $14.2 $— 
Liabilities:
Deferred compensation liabilities
$35.9 $— $35.9 $— 
Contingent consideration and acquired contingent liabilities
27.1 — — 27.1 

$63.0 $— $35.9 $27.1 
December 25,
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$33.0 $23.5 $9.5 $— 
Equity securities31.1 31.1 — — 
$64.1 $54.6 $9.5 $— 
Liabilities:
Deferred compensation liabilities$38.0 $— $38.0 $— 
Contingent consideration and acquired contingent liabilities34.7 — — 34.7 
$72.7 $— $38.0 $34.7 

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 ("Silence"), for which quoted prices are available in an active market; therefore, the investment is classified as level 1 and is valued based on quoted 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 liabilities. As part of the acquisition of Stratatech Corporation ("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 $27.1 million and $19.1 million as of September 24, 2021 and December 25, 2020, 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. During the three months ended March 26, 2021, the Company determined it will no longer pursue further development of this asset. The Company determined the fair value of the contingent consideration based on an option pricing model to be zero and $15.6 million as of September 24, 2021 and December 25, 2020, respectively.
Contingent consideration liabilities were classified as LSTC in the unaudited condensed consolidated balance sheet as of September 24, 2021. The following table summarizes the activity for contingent consideration:
Balance as of December 25, 2020$34.7 
Fair value adjustments
(7.6)
Balance as of September 24, 2021$27.1 

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 September 24, 2021 and December 25, 2020:
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 $59.6 million and $56.4 million as of September 24, 2021 and December 25, 2020 (level 1), respectively. As of September 24, 2021, $23.3 million and $36.3 million of the restricted cash balance was included in prepaid and other current assets and other assets, respectively, on the unaudited condensed consolidated balance sheet. As of December 25, 2020, $20.2 million and $36.2 million of the restricted cash balance was included in prepaid and other current assets and other assets, respectively, on the consolidated balance sheet.
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 $51.0 million and $52.3 million as of September 24, 2021 and December 25, 2020, 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 10.00% first and second lien 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:
September 24, 2021December 25, 2020
Carrying
Value
Fair
Value
Carrying
Value
Fair
Value
Level 1:
5.75% senior notes due August 2022$610.3 $353.1 $610.3 $191.2 
4.75% senior notes due April 2023133.7 49.7 133.7 11.1 
5.625% senior notes due October 2023514.7 302.9 514.7 158.9 
5.50% senior notes due April 2025387.2 226.9 387.2 115.4 
10.00% first lien senior notes due April 2025495.0 539.5 495.0 528.4 
10.00% second lien senior notes due April 2025322.9 322.1 322.9 279.0 
Revolving credit facility900.0 900.0 900.0 900.0 
Level 2:
9.50% debentures due May 202210.4 7.7 10.4 4.2 
8.00% debentures due March 20234.4 3.2 4.4 1.3 
Term loan due September 20241,403.9 1,351.5 1,505.2 1,386.9 
Term loan due February 2025372.6 357.7 399.5 367.9 
Total Debt$5,155.1 $4,414.3 $5,283.3 $3,944.3 
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 incurred during the three and nine months ended September 25, 2020 related to the Medicaid lawsuit:
Three Months EndedNine Months Ended
September 24,
2021
September 25,
2020
September 24,
2021
September 25,
2020
CuraScript, Inc.
27.0 %28.1 %25.2 %27.7 %

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:
September 24,
2021
December 25,
2020
AmerisourceBergen Corporation
37.1 %33.6 %
McKesson Corporation
16.2 18.2 

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 incurred during the three and nine months ended September 25, 2020 related to the Medicaid lawsuit:
Three Months EndedNine Months Ended
September 24,
2021
September 25,
2020
September 24,
2021
September 25,
2020
Acthar Gel28.3 %27.9 %26.3 %27.9 %
INOmax19.4 20.3 21.0 21.2 
Ofirmev*12.7 *10.5 
Therakos12.3 *12.3 *