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INVESTMENTS - SCHEDULE OF FIXED MATURITIES AVAILABLE FOR SALE (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | $ 25,264.3 |  |  |
Allowance for credit losses | (37.1) | $ (42.9) | $ (56.0) | $ (7.6)
Estimated fair value | 22,840.5 | 21,506.2 |  |
Below-investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated fair value | 1,225.5 |  |  |
Corporate securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Allowance for credit losses | (31.1) | (41.7) | (54.4) | (7.4)
Corporate securities | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 13,107.1 | 12,590.8 |  |
Gross unrealized gains | 55.5 | 73.0 |  |
Gross unrealized losses | (1,632.9) | (1,347.8) |  |
Allowance for credit losses | (22.5) | (26.6) |  |
Estimated fair value | 11,507.2 | 11,289.4 |  |
Corporate securities | Below-investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 678.2 | 596.1 |  |
Gross unrealized gains | 4.9 | 1.7 |  |
Gross unrealized losses | (30.4) | (34.6) |  |
Allowance for credit losses | (8.6) | (15.1) |  |
Estimated fair value | 644.1 | 548.1 |  |
Certificates of deposit | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 470.0 |  |  |
Gross unrealized gains | 18.3 |  |  |
Gross unrealized losses | 0.0 |  |  |
Allowance for credit losses | 0.0 |  |  |
Estimated fair value | 488.3 |  |  |
United States Treasury securities and obligations of United States government corporations and agencies | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 214.8 | 207.6 |  |
Gross unrealized gains | 0.0 | 0.1 |  |
Gross unrealized losses | (28.6) | (13.3) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 186.2 | 194.4 |  |
States and political subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Allowance for credit losses | (3.3) | (0.7) | (0.9) | 0.0
States and political subdivisions | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 3,238.3 | 2,887.2 |  |
Gross unrealized gains | 12.1 | 31.3 |  |
Gross unrealized losses | (434.6) | (360.2) |  |
Allowance for credit losses | (0.5) | (0.6) |  |
Estimated fair value | 2,815.3 | 2,557.7 |  |
States and political subdivisions | Below-investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 23.6 | 9.6 |  |
Gross unrealized gains | 0.1 | 0.0 |  |
Gross unrealized losses | (1.8) | (0.5) |  |
Allowance for credit losses | (2.9) | (0.1) |  |
Estimated fair value | 19.0 | 9.0 |  |
Foreign governments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Allowance for credit losses | (1.0) | (0.4) | (0.4) | (0.2)
Foreign governments | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 107.3 | 92.7 |  |
Gross unrealized gains | 0.1 | 1.2 |  |
Gross unrealized losses | (15.3) | (10.4) |  |
Allowance for credit losses | (0.9) | (0.4) |  |
Estimated fair value | 91.2 | 83.1 |  |
Asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Allowance for credit losses | (0.1) | (0.1) | (0.3) | 0.0
Asset-backed securities | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 1,475.1 | 1,364.5 |  |
Gross unrealized gains | 7.5 | 3.9 |  |
Gross unrealized losses | (56.6) | (92.4) |  |
Allowance for credit losses | (0.1) | (0.1) |  |
Estimated fair value | 1,425.9 | 1,275.9 |  |
Asset-backed securities | Below-investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 99.5 | 111.7 |  |
Gross unrealized gains | 0.8 | 0.2 |  |
Gross unrealized losses | (9.9) | (15.4) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 90.4 | 96.5 |  |
Agency residential mortgage-backed securities | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 819.8 | 639.0 |  |
Gross unrealized gains | 5.3 | 9.5 |  |
Gross unrealized losses | (5.5) | (0.5) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 819.6 | 648.0 |  |
Non-agency residential mortgage-backed securities | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 1,253.4 | 1,170.8 |  |
Gross unrealized gains | 11.5 | 7.0 |  |
Gross unrealized losses | (121.6) | (136.3) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 1,143.3 | 1,041.5 |  |
Non-agency residential mortgage-backed securities | Below-investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 382.9 | 499.3 |  |
Gross unrealized gains | 22.0 | 28.8 |  |
Gross unrealized losses | (9.2) | (16.4) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 395.7 | 511.7 |  |
Collateralized loan obligations | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 1,015.2 | 1,042.5 |  |
Gross unrealized gains | 5.6 | 3.3 |  |
Gross unrealized losses | (4.0) | (13.0) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 1,016.8 | 1,032.8 |  |
Commercial mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Allowance for credit losses | (1.6) | 0.0 | $ 0.0 | $ 0.0
Commercial mortgage-backed securities | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 2,275.3 | 2,386.9 |  |
Gross unrealized gains | 3.7 | 0.7 |  |
Gross unrealized losses | (157.8) | (240.9) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 2,121.2 | 2,146.7 |  |
Commercial mortgage-backed securities | Below-investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 103.8 | 100.5 |  |
Gross unrealized gains | 0.0 | 0.0 |  |
Gross unrealized losses | (25.9) | (29.1) |  |
Allowance for credit losses | (1.6) | 0.0 |  |
Estimated fair value | 76.3 | 71.4 |  |
Fixed Maturities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 25,264.3 | 23,699.2 |  |
Gross unrealized gains | 147.4 | 160.7 |  |
Gross unrealized losses | (2,534.1) | (2,310.8) |  |
Allowance for credit losses | (37.1) | (42.9) |  |
Estimated fair value | 22,840.5 | 21,506.2 |  |
Fixed Maturities | Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 23,976.3 | 22,382.0 |  |
Gross unrealized gains | 119.6 | 130.0 |  |
Gross unrealized losses | (2,456.9) | (2,214.8) |  |
Allowance for credit losses | (24.0) | (27.7) |  |
Estimated fair value | 21,615.0 | 20,269.5 |  |
Fixed Maturities | Below-investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 1,288.0 | 1,317.2 |  |
Gross unrealized gains | 27.8 | 30.7 |  |
Gross unrealized losses | (77.2) | (96.0) |  |
Allowance for credit losses | (13.1) | (15.2) |  |
Estimated fair value | $ 1,225.5 | $ 1,236.7 |  |

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