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INVESTMENTS (Tables)
6 Months Ended
Jun. 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 June 30, 2024
Fair Value of Securities with Contractual Maturities
(in millions)Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueWithin 1 YearAfter 1 Year through 5 YearsAfter 5 Years
U.S. Treasury$20.1 $— $(0.2)$19.9 $3.4 $13.5 $3.0 
Municipal securities9.7 — (0.1)9.6 1.5 3.7 4.4 
Corporate debt20.0 — (0.2)19.8 — 14.6 5.2 
Total$49.8 $— $(0.5)$49.3 $4.9 $31.8 $12.6