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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Debt Securities
Marketable debt securities accounted for as AFS were as follows:

As of September 30, 2024
Fair Value of Securities with Contractual Maturities
(in millions)Amortized Cost
Total
Gains1
Total Losses1
Fair ValueWithin 1 YearAfter 1 Year through 5 YearsAfter 5 Years
U.S. Treasury$20.2 $0.3 $— $20.5 $3.4 $13.9 $3.2 
Municipal securities10.0 0.2 — 10.2 1.5 3.8 4.9 
Corporate debt20.6 0.4 — 21.0 1.9 14.1 5.0 
Total$50.8 $0.9 $— $51.7 $6.8 $31.8 $13.1 
1Represents total unrealized gains (losses) for securities with net gains (losses) in accumulated other comprehensive income as of September 30, 2024.