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INVESTMENTS - Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due in 1 year or less | $ 23.5 |
Due after 1 year through 5 years | 4.5 |
Due after 5 years through 10 years | 0.0 |
Instruments not due at a single maturity date | 0.0 |
Amortized Cost | 28.0 |
Fair Value |  |
Due in 1 year or less | 23.5 |
Due after 1 year through 5 years | 4.5 |
Due after 5 years through 10 years | 0.0 |
Instruments not due at a single maturity date | 0.0 |
Fair Value | 28.0 |
Amortized Cost |  |
Due in 1 year or less | 366.5 |
Due after 1 year through 5 years | 647.3 |
Due after 5 years through 10 years | 5.2 |
Instruments not due at a single maturity date | 345.4 |
Amortized Cost | 1,364.4 | $ 1,549.1
Fair Value |  |
Due in 1 year or less | 358.2 |
Due after 1 year through 5 years | 614.8 |
Due after 5 years through 10 years | 5.1 |
Instruments not due at a single maturity date | 331.2 |
Fair Value | $ 1,309.3 | $ 1,481.0

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