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FAIR VALUE MEASUREMENTS - SIGNIFICANT UNOBSERVABLE (LEVEL 3) INPUTS (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 324.7 | $ 302.1
Gains (losses) included in net income | (0.1) | 10.7
Gains (losses) included in accumulated other comprehensive loss | 2.9 | (5.6)
Purchases | 81.6 | 16.0
Sales | (14.8) | (1.6)
Transfers into Level 3 | 66.0 | 6.4
Transfers out of Level 3 | (107.1) | (30.1)
Ending balance | 353.2 | 297.9
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | 0.0 | 10.7
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period | 1.9 | (6.5)
Total Fixed Maturities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 155.9 | 197.9
Gains (losses) included in net income | 0.0 | 4.4
Gains (losses) included in accumulated other comprehensive loss | 2.9 | (5.6)
Purchases | 81.6 | 6.8
Sales | (14.8) | (0.3)
Transfers into Level 3 | 66.0 | 0.0
Transfers out of Level 3 | (14.3) | (30.1)
Ending balance | 277.3 | 173.1
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | 0.1 | 4.4
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period | 1.9 | (6.5)
Equity Securities | Corporate securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 73.4 | 72.7
Gains (losses) included in net income | (0.1) | (0.1)
Gains (losses) included in accumulated other comprehensive loss | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales | 0.0 | 0.0
Transfers into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0
Ending balance | 73.3 | 72.6
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | (0.1) | (0.1)
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period | 0.0 | 0.0
Other Invested Assets | Residual Tranches |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 95.4 | 31.5
Gains (losses) included in net income | 0.0 | 6.4
Gains (losses) included in accumulated other comprehensive loss | 0.0 | 0.0
Purchases | 0.0 | 9.2
Sales | 0.0 | (1.3)
Transfers into Level 3 | 0.0 | 6.4
Transfers out of Level 3 | (92.8) | 0.0
Ending balance | 2.6 | 52.2
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | 0.0 | 6.4
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period | $ 0.0 | $ 0.0

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