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MARKETABLE SECURITIES - Contractual Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Less than one year | $ 15.9 |
One to five years | 30.9 |
Six to ten years | 38.1 |
Greater than ten years | 84.6 |
Amortized Cost | 169.5 | $ 201.6
Fair Value |  |
Less than one year | 15.9 |
One to five years | 30.9 |
Six to ten years | 37.8 |
Greater than ten years | 79.7 |
Total Debt Securities | $ 164.3 | $ 185.5

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