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FAIR VALUE MEASUREMENTS - SIGNIFICANT UNOBSERVABLE (LEVEL 3) INPUTS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 551.6 | $ 295.1 | $ 324.7 | $ 302.1
Gains (losses) included in net income | (1.7) | (1.4) | 0.5 | 14.9
Gains (losses) included in accumulated other comprehensive loss | 4.2 | 6.6 | 1.2 | (1.9)
Purchases | 177.5 | 22.9 | 420.0 | 47.8
Sales | (9.7) | (13.0) | (24.0) | (26.4)
Transfers into Level 3 | 10.5 | 12.4 | 89.8 |
Transfers Into Level 3 |  |  |  | 7.5
Transfers out of Level 3 | (70.1) | (17.1) | (149.9) | (38.5)
Ending balance | 662.3 | 305.5 | 662.3 | 305.5
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | (1.7) | 1.0 | 0.6 | 17.5
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period | 3.9 | 5.8 | 0.0 | (4.4)
Fixed Maturities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 454.6 | 153.5 | 155.9 | 197.9
Gains (losses) included in net income | (2.0) | (2.4) | (0.3) | 1.9
Gains (losses) included in accumulated other comprehensive loss | 4.2 | 6.6 | 1.2 | (1.9)
Purchases | 177.5 | 12.3 | 420.0 | 17.8
Sales | (9.7) | (12.0) | (24.0) | (21.1)
Transfers into Level 3 | 10.5 | 12.4 | 89.8 |
Transfers Into Level 3 |  |  |  | 0.0
Transfers out of Level 3 | (49.6) | (14.3) | (57.1) | (38.5)
Ending balance | 585.5 | 156.1 | 585.5 | 156.1
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | (2.0) | 0.1 | (0.3) | 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 | 3.9 | 5.8 | 0.0 | (4.4)
Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 94.4 | 72.8 | 73.4 | 72.7
Gains (losses) included in net income | 0.3 | 0.6 | 0.8 | 0.7
Gains (losses) included in accumulated other comprehensive loss | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Transfers into Level 3 | 0.0 | 0.0 | 0.0 |
Transfers Into Level 3 |  |  |  | 0.0
Transfers out of Level 3 | (20.5) | 0.0 | 0.0 | 0.0
Ending balance | 74.2 | 73.4 | 74.2 | 73.4
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | 0.3 | 0.5 | 0.9 | 0.8
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 | 0.0 | 0.0
Trading Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 0.0 | 2.8 | 0.0 | 0.0
Gains (losses) included in net income | 0.0 | 0.0 | 0.0 | 0.0
Gains (losses) included in accumulated other comprehensive loss | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Transfers into Level 3 | 0.0 | 0.0 | 0.0 |
Transfers Into Level 3 |  |  |  | 0.0
Transfers out of Level 3 | 0.0 | (2.8) | 0.0 | 0.0
Ending balance | 0.0 | 0.0 | 0.0 | 0.0
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 | 0.0 | 0.0 | 0.0
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 | 0.0 | 0.0
Other Invested Assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 2.6 | 66.0 | 95.4 | 31.5
Gains (losses) included in net income | 0.0 | 0.4 | 0.0 | 12.3
Gains (losses) included in accumulated other comprehensive loss | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 10.6 | 0.0 | 30.0
Sales | 0.0 | (1.0) |  | (5.3)
Transfers into Level 3 | 0.0 | 0.0 | 0.0 |
Transfers Into Level 3 |  |  |  | 7.5
Transfers out of Level 3 | 0.0 | 0.0 | (92.8) | 0.0
Ending balance | 2.6 | 76.0 | 2.6 | 76.0
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 | 0.4 | 0.0 | 12.3
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 | $ 0.0 | $ 0.0

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