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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Assets: |  |  |
Unrealized gains (losses) on equity securities | $ 7.6 | $ (14.7) |
Fair Value, Measurements, Recurring | Level 1 |  |  |
Assets: |  |  |
Investments in equity securities | 106.2 |  | $ 98.6
Fair Value, Measurements, Recurring | Level 2 |  |  |
Assets: |  |  |
Investments in equity securities | 5.3 |  | 5.3
Fair Value, Measurements, Recurring | Level 3 |  |  |
Assets: |  |  |
Investments in equity securities | $ 0.0 |  | $ 0.0

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