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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Amortized Cost
Due in 1 year or less	$ 53.4
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Amortized Cost	53.4
Fair Value
Due in 1 year or less	53.4
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Fair Value	53.4
Amortized Cost
Due in 1 year or less	295.9
Due after 1 year through 5 years	114.8
Instruments not due at a single maturity date	123.6
Amortized Cost	534.3	$ 926.1
Fair Value
Due in 1 year or less	291.9
Due after 1 year through 5 years	110.4
Instruments not due at a single maturity date	119.3
Fair Value	$ 521.6	$ 898.7

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