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FAIR VALUE MEASUREMENTS - FAIR VALUE ASSETS AND LIABILITIES MEASURED ON A RECURRING BASIS, UNOBSERVABLE INPUT RECONCILIATION (Details) - Fair Value, Inputs, Level 3 - Fair value, Measurements, Recurring - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Corporate securities |  |
Assets: |  |
Beginning balance | $ 159.3 | $ 127.8
Purchases, sales, issuances and settlements, net | 13.9 | 26.3
Realized and unrealized gains (losses) included in net income | (2.6) | (1.7)
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | (3.5) | 8.3
Transfers into level 3 | 0.0 | 9.2
Transfers out of level 3 | (39.1) | (10.6)
Ending balance | 128.0 | 159.3
Gains (losses) included in net income relating to assets still held at year-end | (0.1) | (1.7)
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end | (5.9) | 5.1
Asset-backed securities |  |
Assets: |  |
Beginning balance | 25.5 | 57.0
Purchases, sales, issuances and settlements, net | (0.7) | (6.3)
Realized and unrealized gains (losses) included in net income | 0.0 | (0.2)
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 | (1.7)
Transfers into level 3 | 0.0 | 0.0
Transfers out of level 3 | (5.0) | (23.3)
Ending balance | 19.8 | 25.5
Gains (losses) included in net income relating to assets still held at year-end | 0.0 | 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end | (3.4) | (1.9)
Non-agency residential mortgage-backed securities |  |
Assets: |  |
Beginning balance | 0.0 | 56.2
Purchases, sales, issuances and settlements, net | 0.0 | 0.0
Realized and unrealized gains (losses) included in net income | 0.0 | 0.0
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 | 0.0
Transfers into level 3 | 0.0 | 0.0
Transfers out of level 3 | 0.0 | (56.2)
Ending balance | 0.0 | 0.0
Gains (losses) included in net income relating to assets still held at year-end | 0.0 | 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end | 0.0 | 0.0
Collateralized loan obligations |  |
Assets: |  |
Beginning balance | 0.0 | 3.4
Purchases, sales, issuances and settlements, net | 4.0 | 0.0
Realized and unrealized gains (losses) included in net income | 0.0 | 0.0
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 | 0.0
Transfers into level 3 | 0.0 | 0.0
Transfers out of level 3 | 0.0 | (3.4)
Ending balance | 4.0 | 0.0
Gains (losses) included in net income relating to assets still held at year-end | 0.0 | 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end | 0.0 | 0.0
Commercial mortgage-backed securities |  |
Assets: |  |
Beginning balance | 13.1 | 14.5
Purchases, sales, issuances and settlements, net | 0.0 | 0.0
Realized and unrealized gains (losses) included in net income | (1.6) | 0.0
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.9 | (1.4)
Transfers into level 3 | 4.8 | 0.0
Transfers out of level 3 | (13.1) | 0.0
Ending balance | 4.1 | 13.1
Gains (losses) included in net income relating to assets still held at year-end | (1.6) | 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end | 1.0 | (1.5)
Total fixed maturities, available for sale |  |
Assets: |  |
Beginning balance | 197.9 | 258.9
Purchases, sales, issuances and settlements, net | 17.2 | 20.0
Realized and unrealized gains (losses) included in net income | (4.2) | (1.9)
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | (2.6) | 5.2
Transfers into level 3 | 4.8 | 9.2
Transfers out of level 3 | (57.2) | (93.5)
Ending balance | 155.9 | 197.9
Gains (losses) included in net income relating to assets still held at year-end | (1.7) | (1.7)
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end | (8.3) | 1.7
Equity securities - corporate securities |  |
Assets: |  |
Beginning balance | 72.7 | 75.7
Purchases, sales, issuances and settlements, net | 0.0 | (2.1)
Realized and unrealized gains (losses) included in net income | 0.7 | (0.9)
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 | 0.0
Transfers into level 3 | 0.0 | 0.0
Transfers out of level 3 | 0.0 | 0.0
Ending balance | 73.4 | 72.7
Gains (losses) included in net income relating to assets still held at year-end | 0.8 | (0.5)
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end | 0.0 | 0.0
Trading securities - non-agency residential mortgage-backed securities |  |
Assets: |  |
Beginning balance | 0.0 | 0.5
Purchases, sales, issuances and settlements, net | 0.0 | 0.0
Realized and unrealized gains (losses) included in net income | 0.0 | 0.0
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 | 0.0
Transfers into level 3 | 0.0 | 0.0
Transfers out of level 3 | 0.0 | (0.5)
Ending balance | 0.0 | 0.0
Gains (losses) included in net income relating to assets still held at year-end | 0.0 | 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end | 0.0 | 0.0
Other invested assets - residual tranches |  |
Assets: |  |
Beginning balance | 31.5 | 18.3
Purchases, sales, issuances and settlements, net | 37.3 | 13.1
Realized and unrealized gains (losses) included in net income | 19.1 | 0.1
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 | 0.0
Transfers into level 3 | 7.5 | 0.0
Transfers out of level 3 | 0.0 | 0.0
Ending balance | 95.4 | 31.5
Gains (losses) included in net income relating to assets still held at year-end | 19.1 | 0.1
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end | $ 0.0 | $ 0.0

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