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Cash, Cash Equivalents and Short-Term Investments (Tables)
3 Months Ended
Mar. 31, 2022
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 March 31, 2022 and December 31, 2021 consisted of the following:

As of March 31, 2022
Amortized CostUnrealized GainUnrealized LossEstimated Fair Value
Cash$85.8 $— $— $85.8 
Cash equivalents
Money market funds349.7— — $349.7 
Commercial paper10.0— — $10.0 
Total cash & cash equivalents$445.5 $— $— $445.5 
Short-term investments
Corporate notes and obligations531.7— (15.6)516.1
U.S. Treasury securities264.6— (9.2)255.4
Asset backed securities138.7— (4.4)134.3
Municipal securities68.7— (2.8)65.9
Commercial paper24.4— — 24.4
Certificates of deposit19.0— — 19.0
U.S. agency obligations14.5— (0.5)14.0
Foreign government obligations13.5— (0.3)13.2
Supranational securities8.0— (0.2)7.8
Total short-term investments1,083.1 — (33.0)1,050.1 
Total$1,528.6 — $(33.0)$1,495.6 


As of December 31, 2021
Amortized CostUnrealized GainUnrealized LossEstimated Fair Value
Cash$142.7 $— $— $142.7 
Cash equivalents
Money market funds390.3— — 390.3 
Total cash & cash equivalents$533.0 $— $— $533.0 
Short-term investments
Corporate notes and obligations607.40.4(4.0)603.8
U.S. Treasury securities240.4— (2.9)237.5
Asset backed securities140.70.1(1.2)139.6
Municipal securities70.5— (0.7)69.8
Commercial paper61.7— — 61.7
Certificates of deposit32.1— — 32.1
Foreign government obligations18.4— (0.1)18.3
U.S. agency obligations14.6— (0.2)14.4
Supranational securities8.0— (0.1)7.9
Total short-term investments1,193.8 0.5(9.2)1,185.1 
Total$1,726.8 0.5$(9.2)$1,718.1 
Contractual Maturities of Short Term Investments
The following table presents the contractual maturities of the Company’s short-term investments as of March 31, 2022:

As of March 31, 2022
Amortized costEstimated fair value
Due within one year$304.2 $303.0 
Due between one to three years466.6 453.0 
Due after three years312.3 294.1 
Total$1,083.1 $1,050.1 
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 March 31, 2022 and December 31, 2021:
As of March 31, 2022
Less than 12 monthsMore than 12 monthsTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Corporate notes and obligations$444.2 $(13.5)$28.9 $(2.1)$473.1 $(15.6)
U.S. Treasury securities173.7 (5.3)62.1 (3.9)235.8 (9.2)
Asset backed securities117.9 (4.1)9.5 (0.3)127.4 (4.4)
Municipal securities56.3 (2.3)9.5 (0.5)65.8 (2.8)
U.S. agency obligations10.5 (0.3)3.5 (0.2)14.0 (0.5)
Foreign government obligations11.3 (0.2)1.9 (0.1)13.2 (0.3)
Supranational securities6.1 (0.1)1.6 (0.1)7.7 (0.2)
Total$820.0 $(25.8)$117.0 $(7.2)$937.0 $(33.0)
As of December 31, 2021
Less than 12 monthsMore than 12 monthsTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Corporate notes and obligations$498.6 $(4.1)$— $— $498.6 $(4.1)
U.S. Treasury securities218.0 (2.9)— — 218.0 (2.9)
Asset backed securities120.7 (1.2)— — 120.7 (1.2)
Municipal securities66.0 (0.7)— — 66.0 (0.7)
U.S. agency obligations14.4 (0.2)— — 14.4 (0.2)
Foreign government obligations15.4 — — — 15.4 — 
Supranational securities7.9 (0.1)— — 7.9 (0.1)
Total$941.0 $(9.2)$— $— $941.0 $(9.2)