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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) investment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Variable Interest Entity [Line Items] |  |  |
Repayments of investment borrowings related to variable interest entities, amounts due in 2025 | $ 94.1 |  |
Repayments of investment borrowings related to variable interest entities, amounts due in 2026 | 40.2 |  |
Repayments of investment borrowings related to variable interest entities, amounts due in 2027 | 33.3 |  |
Repayments of investment borrowings related to variable interest entities, amounts due in 2028 | 55.0 |  |
Repayments of investment borrowings related to variable interest entities, amounts due in 2029 and thereafter | 276.0 |  |
Debt securities, available-for-sale at amortized cost | 25,264.3 | $ 23,699.2 |
Variable interest entity amortized cost securities held | 437.0 |  |
Variable interest entity, gross unrealized gains fixed maturity securities | 1.2 |  |
Variable interest entity gross unrealized losses fixed maturity securities | 4.7 |  |
Variable interest entity fixed maturity securities allowance for credit loss | 1.3 |  |
Variable interest entity, estimated fair value of securities held | 432.3 |  |
Estimated fair value | 22,840.5 | 21,506.2 |
Variable interest entities net realized gain (loss) on investments | (16.9) | (4.4) | $ (8.1)
Variable interest entities net loss from sale of fixed maturity investments | 18.7 | 6.8 | 6.3
Variable interest entities change in allowance for current expected credit losses | 1.8 | 2.4 | (1.8)
Variable interest entity, gross investment losses from sale | 23.8 | 6.9 | 6.3
Investments held by VIEs and sold | $ 199.6 | 18.5 | $ 69.2
Number of VIEs in default | investment | 0 |  |
Fair value of investments in unrealized loss position for less than 12 months | $ 2,982.0 | 1,169.9 |
Gross unrealized losses of investments in unrealized loss position for less than 12 months | 70.7 | 24.5 |
Fair value of investments in unrealized loss position for more than 12 months | 8,488.3 | 10,886.4 |
Gross unrealized losses of investments in unrealized loss position for more than 12 months | 1,358.4 | 1,365.0 |
Fixed Maturities |  |  |
Variable Interest Entity [Line Items] |  |  |
Estimated fair value | $ 22,840.5 | 21,506.2 |
Continuous unrealized loss position | 20.00% |  |
Investments held by variable interest entities - corporate securities |  |  |
Variable Interest Entity [Line Items] |  |  |
Estimated fair value | $ 432.3 |  |
Fair value of investments in unrealized loss position for less than 12 months | 183.2 | 24.8 |
Gross unrealized losses of investments in unrealized loss position for less than 12 months | 0.9 | 0.1 |
Fair value of investments in unrealized loss position for more than 12 months | 25.6 | 302.3 |
Gross unrealized losses of investments in unrealized loss position for more than 12 months | 0.3 | 8.7 |
Below-investment Grade |  |  |
Variable Interest Entity [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% |  |
Gross unrealized losses of investments in unrealized loss position for less than 12 months | $ 25.4 |  |
Below-investment Grade | Fixed Maturities |  |  |
Variable Interest Entity [Line Items] |  |  |
Estimated fair value | 1,225.5 | $ 1,236.7 |
Below-investment Grade | Investments held by variable interest entities - corporate securities |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt securities, available-for-sale at amortized cost | $ 423.5 |  |
Percentage of available-for-sale debt securities | 97.00% |  |
Estimated fair value | $ 418.7 |  |
Available-for-sale securities, percentage of amortized cost | 99.00% |  |

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