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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Corporate securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 147.5 | $ 127.8 | $ 159.3 | $ 127.8
Purchases, sales, issuances and settlements, net | 6.2 | 1.7 | 10.6 | 1.3
Total realized and unrealized gains (losses) included in net income | 0.1 | (11.0) | 4.4 | 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | (2.9) | 11.1 | (8.9) | 1.2
Transfers into level 3 | 0.0 | 6.6 | 0.0 | 5.9
Transfers out of level 3 | (23.2) | 0.0 | (37.7) | 0.0
Ending balance | 127.7 | 136.2 | 127.7 | 136.2
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.1 | (11.0) | 4.4 | 0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | (3.7) | 10.3 | (10.5) | (0.3)
Asset-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 25.6 | 41.1 | 25.5 | 57.0
Purchases, sales, issuances and settlements, net | (0.2) | 0.1 | (0.3) | (5.0)
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) | 0.4 | (1.4) | 0.6 | (1.6)
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 | 25.8 | 39.8 | 25.8 | 39.8
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 | 0.1
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | 0.4 | (1.4) | 0.6 | (1.6)
Non-agency residential mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 33.8 |  | 56.2
Purchases, sales, issuances and settlements, net |  | 0.0 |  | 0.0
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) |  | 0.1
Transfers into level 3 |  | 0.0 |  | 0.0
Transfers out of level 3 |  | (27.7) |  | (50.3)
Ending balance |  | 6.0 |  | 6.0
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) |  | 0.1
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 |  | 13.8 | 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) |  | (1.4) | 0.0 | (2.1)
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 | 12.4 | 0.0 | 12.4
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 |  | (1.4) | 0.0 | (2.1)
Total Fixed Maturities, Available For Sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 173.1 | 216.5 | 197.9 | 258.9
Purchases, sales, issuances and settlements, net | 6.0 | 1.8 | 10.3 | (3.7)
Total realized and unrealized gains (losses) included in net income | 0.1 | (11.0) | 4.4 | (0.2)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | (2.5) | 8.2 | (8.3) | (2.4)
Transfers into level 3 | 0.0 | 6.6 | 0.0 | 5.9
Transfers out of level 3 | (23.2) | (27.7) | (50.8) | (64.1)
Ending balance | 153.5 | 194.4 | 153.5 | 194.4
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.1 | (11.0) | 4.4 | 0.1
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | (3.3) | 7.4 | (9.9) | (3.9)
Equity securities - corporate securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 72.6 | 75.0 | 72.7 | 75.7
Purchases, sales, issuances and settlements, net | 0.0 | (2.1) | 0.0 | (2.1)
Total realized and unrealized gains (losses) included in net income | 0.2 | (0.1) | 0.1 | (0.8)
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 | 72.8 | 72.8 | 72.8 | 72.8
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.2 | (0.1) | 0.2 | (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
Trading securities - commercial mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 0.0 |  | 0.0 |
Purchases, sales, issuances and settlements, net | 0.0 |  | 0.0 |
Total realized and unrealized gains (losses) included in net income | 0.0 |  | (0.1) |
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 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 |
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.0 |  | (0.1) |
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 |
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 |  | 0.5
Purchases, sales, issuances and settlements, net |  | 0.0 |  | 0.0
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) |  | 0.0 |  | 0.0
Transfers into level 3 |  | 0.0 |  | 0.0
Transfers out of level 3 |  | (0.5) |  | (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 |  | 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 |  | 0.0
Other invested assets - residual tranches |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 52.2 | 19.2 | 31.5 | 18.3
Purchases, sales, issuances and settlements, net | 5.6 | 0.1 | 15.0 | 1.5
Total realized and unrealized gains (losses) included in net income | 5.6 | 0.1 | 12.0 | 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 | 2.6 | 0.9 | 7.5 | 0.0
Transfers out of level 3 | 0.0 | (12.8) | 0.0 | (12.7)
Ending balance | 66.0 | 7.5 | 66.0 | 7.5
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 5.6 | 0.1 | 12.0 | 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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