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v3.23.3

INVESTMENTS - NARRATIVE (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) investment | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) loan mortgage_loan investment | Sep. 30, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net realized investment gains (losses) | $ (29.3) | $ (17.7) | $ (79.2) | $ (99.2)
Change in allowance for credit losses | $ 2.3 | (7.5) | $ 13.7 | 46.9
Number of investments in default or considered nonperforming | investment | 0 |  | 0 |
Value of available for sale securities sold |  |  | $ 527.0 | 1,321.7
Total fixed maturities, available for sale |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale | $ 9.8 | $ 24.4 | 45.8 | 81.3
Embedded Derivative Related to Fixed Maturity Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Change in fair value of certain investments with embedded derivatives |  |  | (11.4) | (37.4)
Reinsurance Contract | Coinsurance |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Change in fair value of certain investments with embedded derivatives |  |  | (2.5) | (16.1)
Marketable Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net realized investment gains (losses) |  |  | (50.5) | 11.9
Equity Securities - Corporate Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net realized investment gains (losses) |  |  | (1.1) | (10.7)
Commercial mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  | 6.0 |
Corporate Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  | 37.8 | 54.3
Non-agency residential mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  |  | 14.0
States and political subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  |  | 7.3
Various Other Investments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  | 2.0 | $ 5.7
Carrying Value | Residential Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 571.6 |  | 571.6 |
Fair Value | Residential Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 572.4 |  | $ 572.4 |
Commercial Portfolio Segment |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans in process of foreclosure | mortgage_loan |  |  | 0 |
Carrying value of loans | 1,410.6 |  | $ 1,410.6 |
Commercial Portfolio Segment | Carrying Value | Commercial Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 1,410.6 |  | 1,410.6 |
Commercial Portfolio Segment | Fair Value | Commercial Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 1,217.8 |  | $ 1,217.8 |
Residential Portfolio Segment | Financial Asset, Past Due |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans noncurrent | loan |  |  | 5 |
Carrying value of loans | 2.3 |  | $ 2.3 |
Residential Portfolio Segment | Foreclosure | Financial Asset, Past Due |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans noncurrent | loan |  |  | 4 |
Carrying value of loans | $ 2.0 |  | $ 2.0 |

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