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INVESTMENTS - NARRATIVE (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) mortgage_loan loan investment state | Dec. 31, 2023 USD ($) investment | Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale at amortized cost | $ 25,264.3 | $ 23,699.2 |
Estimated fair value | 22,840.5 | 21,506.2 |
Amortized cost | 25,264.3 |  |
Amortized cost of fixed maturity investments not accruing investment income | 5.7 |  |
Carrying value of fixed maturity investments not accruing investment income | 4.1 |  |
Net realized investment gains (losses) | (49.9) | (69.0) | $ (135.4)
Gain on dissolution of variable interest entities | 3.9 | 0.0 | 0.0
Change in allowance for credit losses and write-downs | (2.6) | 8.1 | (52.6)
Value of available for sale securities sold | 1,432.0 | 712.2 | 1,651.5
Estimated fair value | $ 7,089.3 |  |
Percent of fixed maturities | 31.00% |  |
Number of additional states greater than specified percentage of mortgage loan balance | state | 0 |  |
Assets held by insurance regulators | $ 38.2 | $ 38.0 |
Number of investments in excess of 10% of shareholders' equity | investment | 0 | 0 |
Commercial Portfolio Segment |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost of loans | $ 1,501.4 |  |
Fair value of loans | $ 1,344.2 |  |
Number of mortgage loans in foreclosure | mortgage_loan | 0 |  |
Residential Portfolio Segment | Financial Asset, Past Due |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost of loans | $ 15.6 |  |
Number of mortgage loans noncurrent | loan | 21 |  |
Residential Portfolio Segment | Financial Asset, Past Due | Foreclosure |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost of loans | $ 3.7 |  |
Number of mortgage loans noncurrent | loan | 8 |  |
Minimum |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Percentage of mortgage loan balance | 5.00% |  |
California |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Percentage of mortgage loan balance | 17.00% |  |
Maryland |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Percentage of mortgage loan balance | 7.00% |  |
Wisconsin |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Percentage of mortgage loan balance | 6.00% |  |
Utah |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Percentage of mortgage loan balance | 6.00% |  |
Georgia |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Percentage of mortgage loan balance | 5.00% |  |
Corporate securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized losses on sale | $ 35.7 | $ 48.8 | 70.9
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized losses on sale |  | 6.7 |
Other Investments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized losses on sale | 6.7 | 3.4 | 9.1
Residential Mortgage | Total amortized cost |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage loans | 1,018.6 |  |
Residential Mortgage | Estimated fair value |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage loans | 1,031.8 |  |
Non-agency residential mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized losses on sale |  |  | 16.5
States and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized losses on sale |  |  | 7.5
Fixed indexed annuities - embedded derivative |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Increase (decreases) in fair value of certain fixed maturity investments with embedded derivatives | 24.4 | (8.5) | (45.9)
Reinsurance Contract | Embedded derivative related to modified coinsurance agreement |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Increase (decreases) in fair value of certain fixed maturity investments with embedded derivatives | 0.4 | 0.3 | (16.1)
Marketable Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Net realized investment gains (losses) | (75.6) | (68.7) | (9.6)
Equity Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Net realized investment gains (losses) | (0.4) | (0.2) | (11.2)
Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Estimated fair value | 22,840.5 | 21,506.2 |
Amortized cost | $ 25,264.3 | 23,699.2 |
Continuous unrealized loss position | 20.00% |  |
Total fixed maturities, available for sale |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized losses on sale | $ 54.9 | 58.9 | $ 104.0
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized losses on sale | 12.5 |  |
Estimated fair value | $ 2,197.4 |  |
Percent of fixed maturities | 9.60% |  |
NAIC |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Percentage of available-for-sale debt securities | 3.60% |  |
Estimated fair value | $ 837.5 |  |
Available-for-sale securities, percentage of amortized cost | 92.00% |  |
Amortized cost | $ 911.2 |  |
Below-investment Grade |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale at amortized cost | $ 1,288.0 |  |
Percentage of available-for-sale debt securities | 5.10% |  |
Estimated fair value | $ 1,225.5 |  |
Available-for-sale securities, percentage of amortized cost | 95.00% |  |
Continuous unrealized loss position | 20.00% |  |
Below-investment Grade | Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Estimated fair value | $ 1,225.5 | 1,236.7 |
Amortized cost | 1,288.0 | 1,317.2 |
Below-investment Grade | Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Estimated fair value | 76.3 | 71.4 |
Amortized cost | $ 103.8 | $ 100.5 |

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