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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in 1 year or less	$ 56.0
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Amortized Cost	56.0
Fair Value
Due in 1 year or less	56.0
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Fair Value	56.0
Amortized Cost
Due in 1 year or less	422.8
Due after 1 year through 5 years	181.6
Instruments not due at a single maturity date	163.3
Amortized Cost	767.7	$ 926.1
Fair Value
Due in 1 year or less	417.0
Due after 1 year through 5 years	174.8
Instruments not due at a single maturity date	158.0
Fair Value	$ 749.8	$ 898.7

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