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Cash, Cash Equivalents, and Short-term Investments (Tables)
 3 Months Ended
Mar. 31, 2024
Cash and Cash Equivalents [Abstract]  
Schedule of Cash and Cash Equivalents
Cash, cash equivalents, and short-term investments consisted of the following as of March 31, 2024:
(in millions)Amortized CostUnrealized GainsUnrealized LossesEstimated Fair Value
Cash$153.0 $— $— $153.0 
Cash equivalents:
Money market mutual funds252.9 — — 252.9 
Total cash and cash equivalents$405.9 $— $— $405.9 
Short-term investments:
Corporate debt securities$18.4 $— $— $18.4 
Securities guaranteed by U.S. government4.7 — — 4.7 
Certificates of deposit11.2 — — 11.2 
Total short-term investments$34.3 $— $— $34.3 
Total cash, cash equivalents, and short-term investments$440.2 $— $— $440.2 
Cash, cash equivalents, and short-term investments consisted of the following as of December 31, 2023:
(in millions)Amortized CostUnrealized GainsUnrealized LossesEstimated Fair Value
Cash$201.9 $— $— $201.9 
Cash equivalents:
Money market mutual funds245.2 — — 245.2 
Total cash and cash equivalents$447.1 $— $— $447.1 
Short-term investments:
Corporate debt securities$37.4 $— $— $37.4 
Securities guaranteed by U.S. government26.7 — — 26.7 
Other government securities18.1 — — 18.1 
Total short-term investments$82.2 $— $— $82.2 
Total cash, cash equivalents, and short-term investments$529.3 $— $— $529.3 
Schedule of Short-term Securities
The following table summarizes the cost and estimated fair value of the securities classified as short-term investments based on stated effective maturities as of March 31, 2024 and December 31, 2023:
March 31, 2024
December 31, 2023
(in millions)Amortized CostEstimated Fair ValueAmortized CostEstimated Fair Value
Due within one year$34.3 $34.3 $82.2 $82.2 
Total$34.3 $34.3 $82.2 $82.2