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Fair Value of Financial Assets and Liabilities
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities
5. Fair Value of Financial Assets and Liabilities
The Company’s cash and cash equivalents of
 
$618.3 million and $440.1 million as of December 31, 2021 and 2020, respectively, are held in cash and money market funds which are classified as Level 1 within the fair value hierarchy because they are valued using quoted prices in active markets. These are the Company’s only Level 1 financial instruments. The Company does not hold any Level 2 financial instruments. The
Company’s
contingent consideration liabilities of $24.4 million and $39.8 million as of December 31, 2021 and 2020, respectively, are the Company’s only
Level 
3 financial instruments.
There were
 no transfers of financial instruments between Level 1, Level 2 and Level 3 during the periods presented.
Level 3 Financial Liabilities
The Company’s Level 3 financial liabilities relate to contingent consideration for acquisitions. Contingent consideration represents obligations of the Company to transfer cash and common stock to the sellers of certain acquired entities in the event that certain targets and milestones are met. As of December 31, 2021, the undiscounted maximum payment under these arrangements was $24.4 million which is expected to be paid over a period of up to 4 years. The primary method the Company used to estimate the fair value of the contingent consideration was a Monte Carlo simulation, which is based on significant inputs, such as forecasted future results of the acquired businesses, which are not observable in the market, discount rates and earnings volatility measures. The changes in the fair value of Level 3 financial liabilities are included within Operations and support in the accompanying consolidated statement
s
of operations (see Note 3 — “Business Combinations and Asset Acquisitions”).
The following tables present quantitative information regarding the significant unobservable inputs utilized by the Company to measure its Level 3 liabilities, consisting of different contingent consideration agreements, at fair value on a recurring basis:
 
    
Year Ended December 31,
    
2021
 
2020
 
2019
Discount rate
  
0.0% - 2.0%
 
0.0% - 2.0%
 
0.0% - 4.0%
Weighted average discount rate
   0.5%   1.3%   3.3%
Earnings volatility
  
0.0% - 15.0%
 
0.0% - 18.0%
 
0.0% - 45.0%
Weighted average earnings volatility
   3.3%   6.9%   12.0%
The following tables present the balances of contingent consideration as presented in the consolidated balance sheets (in millions):
 
 
  
December 31,
 
 
  
2021
 
  
2020
 
Accrued expenses and other current liabilities
  
$
 12.9
 
  
$
 19.1
 
Other
non-current
liabilities
  
 
11.5
 
  
 
20.7
 
 
  
 
 
 
  
 
 
 
Total contingent consideration
  
$
24.4
 
  
$
39.8