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INVESTMENTS - Other Investments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |
Other investments | $ 4.4 |  | $ 4.7
Net realized gains on investments | $ 1.2 | $ 2.4 |

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