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FAIR VALUE MEASUREMENTS - BALANCE SHEET RECURRING (Details) - Significant unobservable inputs (Level 3) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Corporate securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 127.7 | $ 136.2 | $ 159.3 | $ 127.8
Purchases, sales, issuances and settlements, net | 0.4 | 6.3 | (2.9) | 9.1
Total realized and unrealized gains (losses) included in net income | (2.4) | (12.8) | 1.9 | (1.7)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 5.9 | 2.9 | (3.2) | (6.9)
Transfers into level 3 | 12.4 | 1.6 | 0.0 | 5.9
Transfers out of level 3 | (14.3) | (6.4) | (25.4) | (6.4)
Ending balance | 129.7 | 127.8 | 129.7 | 127.8
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.1 | (12.8) | 4.4 | (1.7)
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | 5.1 | 2.1 | (5.7) | (9.2)
Asset-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 25.8 | 39.8 | 25.5 | 57.0
Purchases, sales, issuances and settlements, net | (0.1) | 1.1 | (0.4) | (3.9)
Total realized and unrealized gains (losses) included in net income | 0.0 | 0.0 | 0.0 | (0.2)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.7 | 0.6 | 1.3 | (1.0)
Transfers into level 3 | 0.0 | 0.0 | 0.0 | 0.0
Transfers out of level 3 | 0.0 | 0.0 | 0.0 | (10.4)
Ending balance | 26.4 | 41.5 | 26.4 | 41.5
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.0 | 0.0 | 0.0 | 0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | 0.7 | 0.6 | 1.3 | (1.1)
Non-agency residential mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 6.0 |  | 56.2
Purchases, sales, issuances and settlements, net |  | 0.0 |  | (0.1)
Total realized and unrealized gains (losses) included in net income |  | 0.0 |  | 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) |  | 0.1 |  | 0.2
Transfers into level 3 |  | 2.5 |  | 0.0
Transfers out of level 3 |  | (6.0) |  | (53.7)
Ending balance |  | 2.6 |  | 2.6
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date |  | 0.0 |  | 0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date |  | 0.1 |  | 0.2
Collateralized loan obligations |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 3.4
Purchases, sales, issuances and settlements, net |  |  |  | 0.0
Total realized and unrealized gains (losses) included in net income |  |  |  | 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) |  |  |  | 0.0
Transfers into level 3 |  |  |  | 0.0
Transfers out of level 3 |  |  |  | (3.4)
Ending balance |  | 0.0 |  | 0.0
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date |  |  |  | 0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date |  |  |  | 0.0
Commercial mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 12.4 | 13.1 | 14.5
Purchases, sales, issuances and settlements, net |  | 0.0 | 0.0 | 0.0
Total realized and unrealized gains (losses) included in net income |  | 0.0 | 0.0 | 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) |  | (0.1) | 0.0 | (2.2)
Transfers into level 3 |  | 0.0 | 0.0 | 0.0
Transfers out of level 3 |  | 0.0 | (13.1) | 0.0
Ending balance | 0.0 | 12.3 | 0.0 | 12.3
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date |  | 0.0 | 0.0 | 0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date |  | (0.1) | 0.0 | (2.2)
Total Fixed Maturities, Available For Sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 153.5 | 194.4 | 197.9 | 258.9
Purchases, sales, issuances and settlements, net | 0.3 | 7.4 | (3.3) | 5.1
Total realized and unrealized gains (losses) included in net income | (2.4) | (12.8) | 1.9 | (1.9)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 6.6 | 3.5 | (1.9) | (9.9)
Transfers into level 3 | 12.4 | 4.1 | 0.0 | 5.9
Transfers out of level 3 | (14.3) | (12.4) | (38.5) | (73.9)
Ending balance | 156.1 | 184.2 | 156.1 | 184.2
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.1 | (12.8) | 4.4 | (1.7)
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | 5.8 | 2.7 | (4.4) | (12.3)
Equity securities - corporate securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 72.8 | 72.8 | 72.7 | 75.7
Purchases, sales, issuances and settlements, net | 0.0 | 0.0 | 0.0 | (2.1)
Total realized and unrealized gains (losses) included in net income | 0.6 | (0.2) | 0.7 | (1.0)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 | 0.0 | 0.0 | 0.0
Transfers into level 3 | 0.0 | 0.0 | 0.0 | 0.0
Transfers out of level 3 | 0.0 | 0.0 | 0.0 | 0.0
Ending balance | 73.4 | 72.6 | 73.4 | 72.6
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.5 | (0.2) | 0.8 | (0.5)
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | 0.0 | 0.0 | 0.0 | 0.0
Trading securities - commercial mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 2.8 |  |  |
Purchases, sales, issuances and settlements, net | 0.0 |  |  |
Total realized and unrealized gains (losses) included in net income | 0.0 |  |  |
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 |  |  |
Transfers into level 3 | 0.0 |  |  |
Transfers out of level 3 | (2.8) |  |  |
Ending balance | 0.0 |  | 0.0 |
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.0 |  |  |
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | 0.0 |  |  |
Trading securities - non-agency residential mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 0.5
Purchases, sales, issuances and settlements, net |  |  |  | 0.0
Total realized and unrealized gains (losses) included in net income |  |  |  | 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) |  |  |  | 0.0
Transfers into level 3 |  |  |  | 0.0
Transfers out of level 3 |  |  |  | (0.5)
Ending balance |  | 0.0 |  | 0.0
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date |  |  |  | 0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date |  |  |  | 0.0
Other invested assets - residual tranches |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 66.0 | 7.5 | 31.5 | 18.3
Purchases, sales, issuances and settlements, net | 9.6 | 3.9 | 24.7 | 6.1
Total realized and unrealized gains (losses) included in net income | 0.4 | 0.0 | 12.3 | 0.4
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 | 0.0 | 0.0 | 0.0
Transfers into level 3 | 0.0 | 0.7 | 7.5 | 0.0
Transfers out of level 3 | 0.0 | 0.0 | 0.0 | (12.7)
Ending balance | 76.0 | 12.1 | 76.0 | 12.1
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.4 | 0.0 | 12.3 | 0.4
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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