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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Corporate securities |  |  |  |
Assets: |  |  |  |
Beginning balance | $ 136.2 | $ 124.0 | $ 127.8 | $ 89.7
Purchases, sales, issuances and settlements, net | 6.3 | 2.7 | 9.1 | 13.0
Total realized and unrealized gains (losses) included in net income | (12.8) | (0.9) | (1.7) | (0.1)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 2.9 | (13.4) | (6.9) | (41.7)
Transfers into level 3 | 1.6 | 9.7 | 5.9 | 68.6
Transfers out of level 3 | (6.4) | 0.0 | (6.4) | (7.4)
Ending balance | 127.8 | 122.1 | 127.8 | 122.1
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | (12.8) | (0.9) | (1.7) | 0.4
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | 2.1 | (14.2) | (9.2) | (43.1)
Corporate securities | Investments held by variable interest entities - corporate securities |  |  |  |
Assets: |  |  |  |
Beginning balance |  |  |  | 2.2
Purchases, sales, issuances and settlements, net |  |  |  | (2.1)
Total realized and unrealized gains (losses) included in net income |  |  |  | (0.1)
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 |  |  |  | 0.0
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
Asset-backed securities |  |  |  |
Assets: |  |  |  |
Beginning balance | 39.8 | 29.7 | 57.0 | 26.6
Purchases, sales, issuances and settlements, net | 1.1 | 18.3 | (3.9) | 26.0
Total realized and unrealized gains (losses) included in net income | 0.0 | 0.0 | (0.2) | 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.6 | (3.2) | (1.0) | (6.4)
Transfers into level 3 | 0.0 | 4.1 | 0.0 | 2.7
Transfers out of level 3 | 0.0 | 0.0 | (10.4) | 0.0
Ending balance | 41.5 | 48.9 | 41.5 | 48.9
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 | 0.6 | (3.2) | (1.1) | (6.4)
Non-agency residential mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Beginning balance | 6.0 | 40.5 | 56.2 | 0.0
Purchases, sales, issuances and settlements, net | 0.0 | (0.1) | (0.1) | 6.0
Total realized and unrealized gains (losses) included in net income | 0.0 | 0.0 | 0.0 | 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.1 | (2.5) | 0.2 | (10.3)
Transfers into level 3 | 2.5 | 13.6 | 0.0 | 33.4
Transfers out of level 3 | (6.0) | (22.4) | (53.7) | 0.0
Ending balance | 2.6 | 29.1 | 2.6 | 29.1
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 | 0.1 | (2.5) | 0.2 | (10.3)
Collateralized loan obligations |  |  |  |
Assets: |  |  |  |
Beginning balance |  | 4.4 | 3.4 | 5.0
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) |  | 0.0 | 0.0 | (0.4)
Transfers into level 3 |  | 13.4 | 0.0 | 13.8
Transfers out of level 3 |  | (4.4) | (3.4) | (5.0)
Ending balance | 0.0 | 13.4 | 0.0 | 13.4
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 |  | 0.0 | 0.0 | (0.4)
Commercial mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Beginning balance | 12.4 | 16.5 | 14.5 | 19.0
Purchases, sales, issuances and settlements, net | 0.0 | 0.0 | 0.0 | 28.0
Total realized and unrealized gains (losses) included in net income | 0.0 | 0.0 | 0.0 | 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | (0.1) | (1.1) | (2.2) | (9.4)
Transfers into level 3 | 0.0 | 22.2 | 0.0 | 0.0
Transfers out of level 3 | 0.0 | 0.0 | 0.0 | 0.0
Ending balance | 12.3 | 37.6 | 12.3 | 37.6
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.0 | 0.0 | 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) | (1.1) | (2.2) | (9.5)
Total fixed maturities, available for sale |  |  |  |
Assets: |  |  |  |
Beginning balance | 194.4 | 215.1 | 258.9 | 140.3
Purchases, sales, issuances and settlements, net | 7.4 | 20.9 | 5.1 | 73.0
Total realized and unrealized gains (losses) included in net income | (12.8) | (0.9) | (1.9) | (0.1)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 3.5 | (20.2) | (9.9) | (68.2)
Transfers into level 3 | 4.1 | 63.0 | 5.9 | 118.5
Transfers out of level 3 | (12.4) | (26.8) | (73.9) | (12.4)
Ending balance | 184.2 | 251.1 | 184.2 | 251.1
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | (12.8) | (0.9) | (1.7) | 0.4
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | 2.7 | (21.0) | (12.3) | (69.7)
Equity securities - corporate securities |  |  |  |
Assets: |  |  |  |
Beginning balance | 72.8 | 8.2 | 75.7 | 11.5
Purchases, sales, issuances and settlements, net | 0.0 | 0.0 | (2.1) | 63.9
Total realized and unrealized gains (losses) included in net income | (0.2) | (0.5) | (1.0) | (0.6)
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 | 67.1 | 0.0 | 0.0
Transfers out of level 3 | 0.0 | 0.0 | 0.0 | 0.0
Ending balance | 72.6 | 74.8 | 72.6 | 74.8
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | (0.2) | (0.5) | (0.5) | (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 - Non-agency residential mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Beginning balance |  | 3.4 | 0.5 | 3.5
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) |  | 0.0 | 0.0 | 0.0
Transfers into level 3 |  | 0.0 | 0.0 | 0.0
Transfers out of level 3 |  | (3.4) | (0.5) | (3.5)
Ending balance | 0.0 | 0.0 | 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 | 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 | 0.0
Trading Securities - Commercial mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Beginning balance |  | 6.0 |  | 12.9
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 |  | (6.0) |  | (12.9)
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
Total trading securities |  |  |  |
Assets: |  |  |  |
Beginning balance |  | 9.4 |  | 16.4
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 |  | (9.4) |  | (16.4)
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 |  | 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 |  |  |  |
Assets: |  |  |  |
Beginning balance | 7.5 | 2.6 | 18.3 | 0.0
Purchases, sales, issuances and settlements, net | 3.9 | 1.6 | 6.1 | 2.8
Total realized and unrealized gains (losses) included in net income | 0.0 | (0.5) | 0.4 | 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) | 0.0 | 0.0 | 0.0 | (0.6)
Transfers into level 3 | 0.7 | 0.3 | 0.0 | 1.8
Transfers out of level 3 | 0.0 | 0.0 | (12.7) | 0.0
Ending balance | 12.1 | 4.0 | 12.1 | 4.0
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date | 0.0 | (0.5) | 0.4 | 0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date | $ 0.0 | $ 0.0 | $ 0.0 | $ (0.6)

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