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Investments (Tables)
12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Debt Securities
Marketable debt securities accounted for as AFS were as follows:

As of As of December 31, 2024
Fair Value of Securities with Contractual Maturities
(in millions)Amortized Cost
Gross
Gains1
Gross Losses1
Fair ValueWithin 1 YearAfter 1 Year through 5 YearsAfter 5 Years
U.S. Treasury$20.4 $— $(0.2)$20.2 $3.4 $13.8 $3.1 
Municipal securities10.0 — — 10.0 1.5 7.0 1.5 
Corporate debt21.0 — (0.1)20.9 4.2 13.7 2.9 
Total$51.4 $— $(0.3)$51.1 $9.1 $34.5 $7.5 

(1)Represents total unrealized losses for securities with net losses in accumulated other comprehensive income as of December 31, 2024.