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Fair Value Measurements
9 Months Ended
Sep. 30, 2020
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
Fair Value Measurements at Reporting Date
As of September 30, 2020Fair ValueLevel 1Level 2
Available-for-sale debt securities:
Corporate bonds$2,836.0 — $2,836.0 
U.S. government and government agency obligations134.7 — 134.7 
Sovereign bonds66.6 — 66.6 
Commercial paper390.6 — 390.6 
Certificates of deposit122.5 — 122.5 
Equity securities (unrestricted)41.3 $41.3 — 
Equity securities (restricted)736.3 720.0 16.3 
$4,328.0 $761.3 $3,566.7 
As of December 31, 2019
Available-for-sale debt securities:
Corporate bonds$3,988.1 — $3,988.1 
U.S. government and government agency obligations54.4 — 54.4 
Sovereign bonds27.3 — 27.3 
Commercial paper92.3 — 92.3 
Certificates of deposit72.4 — 72.4 
Equity securities (unrestricted)61.6 $61.6 — 
Equity securities (restricted)557.2 557.2 — 
$4,853.3 $618.8 $4,234.5 
The Company held certain restricted equity securities as of September 30, 2020 which are subject to transfer restrictions that expire at various dates through 2024.
During the three and nine months ended September 30, 2020, we recorded $37.5 million of net unrealized losses and $133.8 million of net unrealized gains, respectively, on equity securities in Other (expense) income, net. During the three and nine months ended September 30, 2019, we recorded $15.7 million of net unrealized gains and $58.4 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 September 30, 2020 and December 31, 2019, the Company had $60.6 million and $55.6 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 our long-term debt (see Note 8 "Senior Notes" for additional details) was estimated to be $1.929 billion as of September 30, 2020, and was determined based on Level 2 inputs.