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INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF INVESTMENTS CLASSIFIED BY CONTRACTUAL MATURITY DATE (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 687.7 |
Due after one year through five years | 2,378.9 |
Due after five years through ten years | 2,056.3 |
Total | 25,264.3 |
Estimated fair value |  |
Due in one year or less | 705.3 |
Due after one year through five years | 2,322.4 |
Due after five years through ten years | 2,004.4 |
Total | 22,840.5 | $ 21,506.2
Investments held by variable interest entities - corporate securities |  |
Amortized cost |  |
Due in one year or less | 3.1 |
Due after one year through five years | 315.3 |
Due after five years through ten years | 118.6 |
Total | 437.0 |
Estimated fair value |  |
Due in one year or less | 3.0 |
Due after one year through five years | 311.0 |
Due after five years through ten years | 118.3 |
Total | $ 432.3 |

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