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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Debt Securities, Available-for-Sale
A summary of our debt securities as of September 30, 2025 is as follows (in millions):
Amortized CostGross Unrealized GainsFair Value
Available-for-sale debt securities:
U.S. government and agency securities$44.6 $0.2 $44.8 
Corporate bonds and notes58.9 0.4 59.3 
Investing information related to our available-for-sale debt securities is as follows (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Proceeds from sales and maturities$16.3 $— $25.0 $— 
The contractual maturities of our available-for-sale debt securities as of September 30, 2025 are as follows (in millions):
Amortized CostFair Value
Due in one year or less$23.9 $23.9 
Due after one year through five years69.5 69.9 
Due after five years through ten years4.7 4.8 
Due after ten years5.4 5.5 
Total$103.5 $104.1