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FAIR VALUE - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | $ 23,560.0 | $ 22,236.0
Fair value of public equity portfolio | 3,400.0 | 2,700.0
Other invested assets | 860.0 | 930.0
Fair Value | Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other invested assets | 316.0 | 292.0
Fixed maturities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | $ 1,700.0 | $ 1,700.0

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