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INVESTMENTS - SUMMARY OF INVESTMENTS BY CONTRACTUAL MATURITY (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 240.4 |
Due after one year through five years | 2,164.6 |
Due after five years through ten years | 2,468.2 |
Due after ten years | 12,859.5 |
Subtotal | 17,732.7 |
Structured securities | 7,496.1 |
Amortized cost | 25,228.8 |
Estimated fair value |  |
Due in one year or less | 239.5 |
Due after one year through five years | 2,146.1 |
Due after five years through ten years | 2,477.3 |
Due after ten years | 10,936.2 |
Subtotal | 15,799.1 |
Structured securities | 7,247.9 |
Estimated fair value | $ 23,047.0 | $ 22,730.1

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