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Fair Value of Financial Assets and Liabilities
3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities
4.    Fair Value of Financial Assets and Liabilities
The Company’s cash and cash equivalents of $475.9 million and $618.3 million as of March 31, 2022 and December 31, 2021, 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 $22.8 million and $24.4 million as of March 31, 2022 and December 31, 2021, respectively, are the Company’s only Level 3 financial instruments.
See Note 3 – “Acquisitions” for changes in contingent consideration for the three months ended March 31, 2022 and 2021. The following table presents the balances of contingent consideration as presented in the condensed consolidated balance sheets (in millions):
 March 31, 2022December 31, 2021
Accrued expenses and other current liabilities$17.4 $12.9 
Other non-current liabilities5.4 11.5 
Total contingent consideration$22.8 $24.4 
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 acquisition-related contingent consideration arrangements. Contingent consideration represents obligations of the Company to transfer cash to the sellers of certain acquired entities in the event that certain targets and milestones are met. The Company estimated the fair value of the contingent consideration using a Monte Carlo simulation, which is based on significant inputs, primarily forecasted future results of the acquired businesses, 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 condensed consolidated statements of operations (see Note 3 – “Acquisitions”).
The following table presents quantitative information regarding the significant unobservable inputs utilized by the Company in the fair value measurement of Level 3 liabilities, consisting of different contingent consideration agreements, measured at fair value on a recurring basis:
 March 31, 2022December 31, 2021
Discount rate
0.0% - 2.0%
0.0% - 2.0%
Weighted average discount rate
0.6%
0.5%
Earnings volatility
0% - 15%
0% - 15%
Weighted average earnings volatility
3.5%
3.3%