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Fair Value Measurements
3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The table below summarizes the Company's assets which are measured at fair value on a recurring basis. The following fair value hierarchy is used to classify assets, based on inputs to valuation techniques utilized to measure fair value:
Level 1 - Quoted prices in active markets for identical assets
Level 2 - Significant other observable inputs, such as quoted market prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, or model-based valuations in which significant inputs used are observable
Level 3 - Significant other unobservable inputs
(In millions)Fair Value Measurements at Reporting Date
As of March 31, 2023
Fair ValueLevel 1Level 2
Cash equivalents$1,422.7 $154.1 $1,268.6 
Available-for-sale debt securities:
Corporate bonds6,592.2 — 6,592.2 
U.S. government and government agency obligations2,903.4 — 2,903.4 
Sovereign bonds70.4 — 70.4 
Commercial paper279.1 — 279.1 
Certificates of deposit153.7 — 153.7 
Asset-backed securities52.5 — 52.5 
Equity securities (unrestricted)20.7 20.7 — 
Equity securities (restricted)1,038.0 1,028.3 9.7 
$12,532.7 $1,203.1 $11,329.6 
As of December 31, 2022
Cash equivalents$1,662.8 $88.3 $1,574.5 
Available-for-sale debt securities:
Corporate bonds6,684.4 — 6,684.4 
U.S. government and government agency obligations2,939.4 — 2,939.4 
Sovereign bonds64.1 — 64.1 
Commercial paper121.1 — 121.1 
Certificates of deposit182.0 — 182.0 
Asset-backed securities27.2 — 27.2 
Equity securities (unrestricted)24.6 24.6 — 
Equity securities (restricted)1,185.4 1,185.4 — 
$12,891.0 $1,298.3 $11,592.7 
The Company held certain restricted equity securities as of March 31, 2023 which are subject to transfer restrictions that expire at various dates through 2024.
During the three months ended March 31, 2023 and 2022, we recorded $164.7 million and $211.2 million of net unrealized losses, respectively, on equity securities in Other (expense) income, net.
In addition to the investments summarized in the table above, as of both March 31, 2023 and December 31, 2022, the Company had $48.3 million in equity investments that do not have a readily determinable fair value. These investments are recorded within Other noncurrent assets.
The fair value of our long-term debt, which was determined based on Level 2 inputs, was estimated to be $1.516 billion and $1.443 billion as of March 31, 2023 and December 31, 2022, respectively.