v3.25.3
Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Summary of financial assets with maturities of less than 90 days included within cash and cash equivalents
The following table summarizes our financial assets with maturities of less than 90 days from the date of purchase included in cash and cash equivalents in our condensed consolidated balance sheets:
(In millions)As of September 30, 2025As of December 31, 2024
Money market funds$3,116.7 $1,664.9 
Short-term debt securities202.9 — 
Commercial paper79.2 — 
Total
$3,398.8 $1,664.9 
Marketable debt and equity securities The following tables summarize our marketable debt and equity securities, classified as available-for-sale:
As of September 30, 2025
(In millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Marketable debt securities
Corporate debt securities:
Current$71.0 $— $— $71.0 
Government securities:
Current26.6 — — 26.6 
Total marketable debt securities$97.6 $— $— $97.6 
Marketable equity securities
Marketable equity securities, non-current$227.8 $— $(123.9)$103.9 
Total marketable equity securities$227.8 $— $(123.9)$103.9 

As of December 31, 2024
(In millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Marketable equity securities
Marketable equity securities, non-current$668.7 $— $(489.0)$179.7 
Total marketable equity securities$668.7 $— $(489.0)$179.7 
The estimated fair value and amortized cost of our marketable debt securities classified as available-for-sale by contractual maturity are summarized as follows:
 As of September 30, 2025
(In millions)Estimated
Fair Value		Amortized
Cost
Due in one year or less$97.6 $97.6 
Total marketable debt securities$97.6 $97.6