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Cash, Cash Equivalents and Short-Term Investments (Tables)
9 Months Ended
Sep. 30, 2023
Cash and Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents and Short-Term Investments
The amortized cost, unrealized gains and losses and estimated fair value of the Company's cash, cash equivalents and short-term investments as of September 30, 2023 and December 31, 2022 consisted of the following:

As of September 30, 2023
Amortized CostUnrealized GainUnrealized LossEstimated Fair Value
Cash$85.2 $— $— $85.2 
Cash equivalents
Money market funds500.6— — 500.6
U.S. Treasury securities14.7 — — 14.7 
Commercial paper2.7 — — 2.7
Corporate notes and obligations0.8 — — 0.8 
Certificates of deposit0.3 — — 0.3 
Total cash & cash equivalents$604.3 $— $— $604.3 
Short-term investments
Corporate notes and obligations313.5— (15.4)298.1
U.S. Treasury securities242.5— (9.6)232.9
Asset backed securities79.2— (3.4)75.8
Municipal securities54.2— (2.9)51.3
Commercial paper19.8 — — 19.8 
U.S. agency obligations10.0 — (0.4)9.6 
Certificates of deposit9.8 — — 9.8 
Foreign government obligations5.9 — (0.2)5.7 
Supranational securities1.8 — (0.2)1.6 
Total short-term investments736.7 — (32.1)704.6 
Total$1,341.0 $— $(32.1)$1,308.9 
As of December 31, 2022
Amortized CostUnrealized GainUnrealized LossEstimated Fair Value
Cash$90.1 $— $— $90.1 
Cash equivalents
Money market funds139.5— — 139.5
Commercial paper3.2— — 3.2 
Total cash & cash equivalents$232.8 $— $— $232.8 
Short-term investments
Corporate notes and obligations512.10.1(22.7)489.5
U.S. Treasury securities360.20.2 (14.0)346.4
Asset backed securities117.6— (6.0)111.6
Municipal securities65.3— (4.1)61.2
Commercial paper46.4— — 46.4
Certificates of deposit29.1— — 29.1
U.S. agency obligations18.4— (0.8)17.6
Foreign government obligations6.0— (0.4)5.6
Supranational securities3.4— (0.2)3.2
Total short-term investments1,158.5 0.3 (48.2)1,110.6 
Total$1,391.3 $0.3 $(48.2)$1,343.4 
Schedule of Contractual Maturities of Short Term Investments
The following table presents the contractual maturities of the Company’s short-term investments as of September 30, 2023:

As of September 30, 2023
Amortized costEstimated fair value
Due within one year$318.0 $312.5 
Due between one to three years357.5 334.6 
Due after three years61.2 57.5 
Total$736.7 $704.6 
Schedule of Short-Term Investments in Continuous Unrealized Loss Position The following tables present the breakdown of the short-term investments that have been in a continuous unrealized loss position aggregated by investment category, as of September 30, 2023 and December 31, 2022:
As of September 30, 2023
Less than 12 monthsMore than 12 monthsTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Corporate notes and obligations$36.5 $(0.3)$255.4 $(15.1)$291.9 $(15.4)
U.S. Treasury securities35.4 (0.6)187.2 (9.0)222.6 (9.6)
Asset backed securities4.3 — 71.6 (3.4)75.9 (3.4)
Municipal securities— — 51.1 (2.9)51.1 (2.9)
U.S. agency obligations2.3 — 3.4 (0.4)5.7 (0.4)
Foreign government obligations— — 5.6 (0.2)5.6 (0.2)
Supranational securities— — 1.6 (0.2)1.6 (0.2)
Total$78.5 $(0.9)$575.9 $(31.2)$654.4 $(32.1)

As of December 31, 2022
Less than 12 monthsMore than 12 monthsTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Corporate notes and obligations$176.5 $(3.5)$292.3 $(19.2)$468.8 $(22.7)
U.S. Treasury securities110.9 (1.8)176.9 (12.2)287.8 (14.0)
Asset backed securities13.7 (0.4)90.4 (5.6)104.1 (6.0)
Municipal securities9.3 (0.3)51.6 (3.8)60.9 (4.1)
U.S. agency obligations3.9 — 13.8 (0.8)17.7 (0.8)
Foreign government obligations— — 5.5 (0.4)5.5 (0.4)
Supranational securities— — 3.2 (0.2)3.2 (0.2)
Total$314.3 $(6.0)$633.7 $(42.2)$948.0 $(48.2)