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INVESTMENTS - SCHEDULE OF AMORTIZED COST, GROSS UNREALIZED GAINS AND LOSSES, ESTIMATED FAIR VALUE, AND ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | $ 26,081.4 |  |  |
Allowance for credit losses | (43.9) | $ (36.0) | $ (38.9) | $ (37.1)
Estimated fair value | 23,881.1 | 23,886.8 |  |
Corporate securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 14,558.6 | 14,568.8 |  |
Gross unrealized gains | 39.6 | 137.1 |  |
Gross unrealized losses | (1,578.6) | (1,413.2) |  |
Allowance for credit losses | (37.8) | (30.2) | $ (33.1) | $ (31.1)
Estimated fair value | 12,981.8 | 13,262.5 |  |
United States Treasury securities and obligations of United States government corporations and agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 208.9 | 207.2 |  |
Gross unrealized gains | 0.0 | 0.1 |  |
Gross unrealized losses | (32.5) | (30.2) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 176.4 | 177.1 |  |
States and political subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 3,250.8 | 3,311.4 |  |
Gross unrealized gains | 21.4 | 25.1 |  |
Gross unrealized losses | (390.2) | (378.9) |  |
Allowance for credit losses | (2.8) | (2.9) |  |
Estimated fair value | 2,879.2 | 2,954.7 |  |
Foreign governments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 134.8 | 130.9 |  |
Gross unrealized gains | 0.4 | 0.9 |  |
Gross unrealized losses | (13.4) | (10.7) |  |
Allowance for credit losses | (1.0) | (0.6) |  |
Estimated fair value | 120.8 | 120.5 |  |
Asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 1,844.1 | 1,780.8 |  |
Gross unrealized gains | 7.8 | 14.0 |  |
Gross unrealized losses | (51.4) | (47.4) |  |
Allowance for credit losses | (0.1) | (0.1) |  |
Estimated fair value | 1,800.4 | 1,747.3 |  |
Agency residential mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 810.6 | 838.3 |  |
Gross unrealized gains | 9.5 | 11.4 |  |
Gross unrealized losses | (0.9) | (0.2) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 819.2 | 849.5 |  |
Non-agency residential mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 1,556.2 | 1,639.1 |  |
Gross unrealized gains | 32.7 | 37.5 |  |
Gross unrealized losses | (85.5) | (90.9) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 1,503.4 | 1,585.7 |  |
Collateralized loan obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 1,466.5 | 1,142.4 |  |
Gross unrealized gains | 1.3 | 2.8 |  |
Gross unrealized losses | (4.2) | (2.7) |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Estimated fair value | 1,463.6 | 1,142.5 |  |
Commercial mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 2,250.9 | 2,157.5 |  |
Gross unrealized gains | 4.1 | 6.4 |  |
Gross unrealized losses | (116.5) | (114.7) |  |
Allowance for credit losses | (2.2) | (2.2) |  |
Estimated fair value | 2,136.3 | 2,047.0 |  |
Total fixed maturities, available for sale |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized cost | 26,081.4 | 25,776.4 |  |
Gross unrealized gains | 116.8 | 235.3 |  |
Gross unrealized losses | (2,273.2) | (2,088.9) |  |
Allowance for credit losses | (43.9) | (36.0) |  |
Estimated fair value | $ 23,881.1 | $ 23,886.8 |  |

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