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MARKETABLE SECURITIES - Contractual Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Less than one year | $ 30.9 |
One to five years | 65.5 |
Six to ten years | 41.8 |
Greater than ten years | 79.3 |
Amortized Cost | 217.5 | $ 213.1
Fair Value |  |
Less than one year | 30.9 |
One to five years | 67.1 |
Six to ten years | 43.9 |
Greater than ten years | 83.4 |
Fair Value | $ 225.3 | $ 224.2

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