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FAIR VALUE MEASUREMENTS - FAIR VALUE ASSETS AND LIABILITIES MEASURED ON A RECURRING BASIS, UNOBSERVABLE INPUT RECONCILIATION - ACTIVITY (Details) - Significant unobservable inputs (Level 3) - Fair value, Measurements, Recurring - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Corporate securities |  |
Assets: |  |
Purchases | $ 44.0 | $ 27.7
Sales | (30.1) | (1.4)
Issuances | 0.0 | 0.0
Settlements | 0.0 | 0.0
Purchases, sales, issuances and settlements, net | 13.9 | 26.3
Asset-backed securities |  |
Assets: |  |
Purchases | 16.4 | 0.0
Sales | (17.1) | (6.3)
Issuances | 0.0 | 0.0
Settlements | 0.0 | 0.0
Purchases, sales, issuances and settlements, net | (0.7) | (6.3)
Collateralized loan obligations |  |
Assets: |  |
Purchases | 4.0 | 0.0
Sales | 0.0 | 0.0
Issuances | 0.0 | 0.0
Settlements | 0.0 | 0.0
Purchases, sales, issuances and settlements, net | 4.0 | 0.0
Total fixed maturities, available for sale |  |
Assets: |  |
Purchases | 64.4 | 27.7
Sales | (47.2) | (7.7)
Issuances | 0.0 | 0.0
Settlements | 0.0 | 0.0
Purchases, sales, issuances and settlements, net | 17.2 | 20.0
Equity securities - corporate securities |  |
Assets: |  |
Purchases | 0.0 | 0.0
Sales | 0.0 | (2.1)
Issuances | 0.0 | 0.0
Settlements | 0.0 | 0.0
Purchases, sales, issuances and settlements, net | 0.0 | (2.1)
Other invested assets - residual tranches |  |
Assets: |  |
Purchases | 44.5 | 13.5
Sales | (7.2) | (0.4)
Issuances | 0.0 | 0.0
Settlements | 0.0 | 0.0
Purchases, sales, issuances and settlements, net | $ 37.3 | $ 13.1

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