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FAIR VALUE MEASUREMENTS - SIGNIFICANT UNOBSERVABLE (LEVEL 3) INPUTS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 353.2 | $ 297.9 | $ 324.7 | $ 302.1
Gains (losses) included in net income | (1.1) | 5.9 | 0.5 | 16.4
Gains (losses) included in accumulated other comprehensive loss | (2.3) | (2.5) | (0.3) | (8.3)
Purchases | 82.8 | 19.9 | 254.4 | 33.6
Sales | (14.2) | (8.3) | (20.0) | (8.3)
Transfers into Level 3 | 149.6 | 5.4 |  | 10.4
Transfers Into Level 3 |  |  | 115.1 |
Transfers out of Level 3 | (16.4) | (23.2) | (122.8) | (50.8)
Ending balance | 551.6 | 295.1 | 551.6 | 295.1
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | (1.1) | 5.9 | 0.5 | 16.5
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period | (3.5) | (3.3) | (2.1) | (9.9)
Fixed Maturities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 277.3 | 173.1 | 155.9 | 197.9
Gains (losses) included in net income | (2.2) | 0.1 | (0.5) | 4.4
Gains (losses) included in accumulated other comprehensive loss | (2.3) | (2.5) | (0.3) | (8.3)
Purchases | 82.8 | 11.3 | 234.4 | 14.2
Sales | (14.2) | (5.3) | (20.0) | (3.9)
Transfers into Level 3 | 129.6 | 0.0 |  | 0.0
Transfers Into Level 3 |  |  | 115.1 |
Transfers out of Level 3 | (16.4) | (23.2) | (30.0) | (50.8)
Ending balance | 454.6 | 153.5 | 454.6 | 153.5
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | (2.2) | 0.1 | (0.5) | 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 | (3.5) | (3.3) | (2.1) | (9.9)
Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 73.3 | 72.6 | 73.4 | 72.7
Gains (losses) included in net income | 1.1 | 0.2 | 1.0 | 0.1
Gains (losses) included in accumulated other comprehensive loss | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 0.0 | 20.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Transfers into Level 3 | 20.0 | 0.0 |  | 0.0
Transfers Into Level 3 |  |  | 0.0 |
Transfers out of Level 3 | 0.0 | 0.0 | 0.0 | 0.0
Ending balance | 94.4 | 72.8 | 94.4 | 72.8
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period | 1.1 | 0.2 | 1.0 | 0.2
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 |  | 0.0
Gains (losses) included in net income |  | 0.0 |  | (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 |  | 2.8 |  | 2.9
Transfers out of Level 3 |  | 0.0 |  | 0.0
Ending balance |  | 2.8 |  | 2.8
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 |  | (0.1)
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 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 2.6 | 52.2 | 95.4 | 31.5
Gains (losses) included in net income | 0.0 | 5.6 | 0.0 | 12.0
Gains (losses) included in accumulated other comprehensive loss | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 8.6 | 0.0 | 19.4
Sales | 0.0 | (3.0) | 0.0 | (4.4)
Transfers into Level 3 | 0.0 | 2.6 |  | 7.5
Transfers Into Level 3 |  |  | 0.0 |
Transfers out of Level 3 | 0.0 | 0.0 | (92.8) | 0.0
Ending balance | 2.6 | 66.0 | 2.6 | 66.0
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 | 5.6 | 0.0 | 12.0
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

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