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v3.24.3

INVESTMENTS - NARRATIVE (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) investment | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) mortgage_loan investment | Sep. 30, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net realized investment gains (losses) | $ 1.2 | $ (29.3) | $ (8.2) | $ (79.2)
Gain on liquidation of variable interest entities | 0.1 | 0.0 | 3.9 | 0.0
Change in allowance for credit losses and write-downs | $ (1.6) | 2.3 | $ (7.2) | 13.7
Number of investments in default or considered nonperforming | investment | 0 |  | 0 |
Value of available for sale securities sold |  |  | $ 1,230.3 | 527.0
Financial Asset, Past Due |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans noncurrent | mortgage_loan |  |  | 0 |
Total Fixed Maturities, Available For Sale |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale | $ 12.8 | $ 9.8 | $ 46.3 | 45.8
Embedded Derivative Related to Fixed Maturity Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives |  |  | 25.2 | (11.4)
Reinsurance Contract | Coinsurance |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives |  |  | 1.9 | (2.5)
Marketable Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net realized investment gains (losses) |  |  | (49.3) | (50.5)
Equity Securities - Corporate Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net realized investment gains (losses) |  |  | 2.9 | (1.1)
Commercial mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  | 9.6 | 6.0
Corporate Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  | 30.9 | 37.8
Various Other Investments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  | 5.8 | $ 2.0
Amortized Cost | Residential Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 870.6 |  | 870.6 |
Fair Value | Residential Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 879.5 |  | $ 879.5 |
Commercial Portfolio Segment |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans in process of foreclosure | mortgage_loan |  |  | 0 |
Amortized cost | 1,518.6 |  | $ 1,518.6 |
Commercial Portfolio Segment | Amortized Cost | Commercial Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 1,518.6 |  | 1,518.6 |
Commercial Portfolio Segment | Fair Value | Commercial Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 1,398.1 |  | $ 1,398.1 |
Residential Portfolio Segment | Financial Asset, Past Due |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans noncurrent | mortgage_loan |  |  | 30 |
Amortized cost | 24.6 |  | $ 24.6 |
Residential Portfolio Segment | Foreclosure | Financial Asset, Past Due |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans noncurrent | mortgage_loan |  |  | 11 |
Amortized cost | $ 5.8 |  | $ 5.8 |

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