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INVESTMENTS - Marketable Securities (Details) $ in Millions	Jun. 30, 2024 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 49.8
Gross Unrealized Gains	0.0
Gross Unrealized Losses	(0.5)
Fair Value	49.3
Fair Value of Securities with Contractual Maturities
Within 1 Year	4.9
After 1 Year through 5 Years	31.8
After 5 Years	12.6
U.S. Treasury
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	20.1
Gross Unrealized Gains	0.0
Gross Unrealized Losses	(0.2)
Fair Value	19.9
Fair Value of Securities with Contractual Maturities
Within 1 Year	3.4
After 1 Year through 5 Years	13.5
After 5 Years	3.0
Municipal securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	9.7
Gross Unrealized Gains	0.0
Gross Unrealized Losses	(0.1)
Fair Value	9.6
Fair Value of Securities with Contractual Maturities
Within 1 Year	1.5
After 1 Year through 5 Years	3.7
After 5 Years	4.4
Corporate debt
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	20.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	(0.2)
Fair Value	19.8
Fair Value of Securities with Contractual Maturities
Within 1 Year	0.0
After 1 Year through 5 Years	14.6
After 5 Years	$ 5.2

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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