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INVESTMENTS - NARRATIVE (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) investment | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) loan investment mortgage_loan | Jun. 30, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net realized investment gains (losses) | $ (17.2) | $ (35.3) | $ (9.4) | $ (49.9)
Gain on liquidation of variable interest entity | 0.0 | 0.0 | 3.8 | 0.0
Change in allowance for credit losses | $ (4.1) | 9.9 | $ (5.6) | 11.4
Number of investments in default or considered nonperforming | investment | 0 |  | 0 |
Value of available for sale securities sold |  |  | $ 669.2 | 388.8
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 | $ 27.6 | $ 21.6 | $ 33.5 | 36.0
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 |  |  | 17.1 | (2.2)
Reinsurance Contract | Coinsurance |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives |  |  | 0.2 | (0.3)
Marketable Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net realized investment gains (losses) |  |  | (36.2) | (35.8)
Equity Securities - Corporate Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net realized investment gains (losses) |  |  | 0.1 | (0.2)
Commercial mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  | 9.2 | 4.3
Corporate Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  | 19.8 | 29.8
Various Other Investments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross realized losses on sale |  |  | 4.5 | $ 1.9
Amortized Cost | Residential Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 702.0 |  | 702.0 |
Fair Value | Residential Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 704.9 |  | $ 704.9 |
Commercial Portfolio Segment |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans in process of foreclosure | mortgage_loan |  |  | 0 |
Amortized cost | 1,487.2 |  | $ 1,487.2 |
Commercial Portfolio Segment | Amortized Cost | Commercial Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 1,487.2 |  | 1,487.2 |
Commercial Portfolio Segment | Fair Value | Commercial Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Mortgage loans | 1,315.6 |  | $ 1,315.6 |
Residential Portfolio Segment | Financial Asset, Past Due |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans noncurrent | loan |  |  | 23 |
Amortized cost | 14.3 |  | $ 14.3 |
Residential Portfolio Segment | Foreclosure | Financial Asset, Past Due |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of mortgage loans noncurrent | loan |  |  | 15 |
Amortized cost | $ 6.6 |  | $ 6.6 |

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