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Fair Value Measurements
12 Months Ended
Dec. 31, 2022
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 December 31, 2022Fair ValueLevel 1Level 2
Available-for-sale debt securities:
Corporate bonds$6,684.4 $— $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 — 
$11,228.2 $1,210.0 $10,018.2 
As of December 31, 2021
Available-for-sale debt securities:
Corporate bonds$7,487.7 $— $7,487.7 
U.S. government and government agency obligations108.5 — 108.5 
Sovereign bonds64.4 — 64.4 
Commercial paper439.6 — 439.6 
Certificates of deposit255.1 — 255.1 
Asset-backed securities41.9 — 41.9 
Equity securities (unrestricted)58.4 58.4 — 
Equity securities (restricted)1,191.5 1,191.5 — 
$9,647.1 $1,249.9 $8,397.2 
The Company held certain restricted equity securities as of December 31, 2022 which are subject to transfer restrictions that expire at various dates through 2024.
During the year ended December 31, 2022, the Company recorded $39.8 million of net unrealized losses on equity securities in Other income (expense), net. During the years ended December 31, 2021 and 2020, the Company recorded $386.1 million, and $196.0 million, respectively, of net unrealized gains on equity securities in Other income (expense), net.
In addition to the investments summarized in the table above, as of December 31, 2022 and 2021, the Company had $48.3 million and $40.0 million, respectively, in equity investments that do not have a readily determinable fair value. These investments are recorded within Other noncurrent assets.
The fair value of the Company's long-term debt (see Note 10), which was determined based on Level 2 inputs, was estimated to be $1.443 billion and $1.887 billion as of December 31, 2022 and 2021, respectively.