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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in 1 year or less | $ 50.5 |
Due after 1 year through 5 years | 0.0 |
Instruments not due at a single maturity date | 0.0 |
Amortized Cost | 50.5 |
Fair Value |  |
Due in 1 year or less | 50.5 |
Due after 1 year through 5 years | 0.0 |
Instruments not due at a single maturity date | 0.0 |
Fair Value | 50.5 |
Amortized Cost |  |
Due in 1 year or less | 721.1 |
Due after 1 year through 5 years | 81.4 |
Instruments not due at a single maturity date | 98.4 |
Amortized Cost | 900.9 | $ 926.1
Fair Value |  |
Due in 1 year or less | 719.2 |
Due after 1 year through 5 years | 79.2 |
Instruments not due at a single maturity date | 95.8 |
Fair Value | $ 894.2 | $ 898.7

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