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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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