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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 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | $ 25,228.8 |  |  |  |  |
Allowance for credit losses | (39.1) | $ (38.9) | $ (37.1) | $ (39.8) | $ (39.0) | $ (42.9)
Estimated fair value | 23,047.0 |  | 22,730.1 |  |  |
Corporate securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 14,058.9 |  | 13,672.1 |  |  |
Gross unrealized gains | 112.6 |  | 60.2 |  |  |
Gross unrealized losses | (1,561.0) |  | (1,660.4) |  |  |
Allowance for credit losses | (33.1) | $ (33.1) | (31.1) | $ (38.6) | $ (37.7) | $ (41.7)
Estimated fair value | 12,577.4 |  | 12,040.8 |  |  |
Certificates of deposit |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 0.0 |  | 470.0 |  |  |
Gross unrealized gains | 0.0 |  | 18.3 |  |  |
Gross unrealized losses | 0.0 |  | 0.0 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 0.0 |  | 488.3 |  |  |
United States Treasury securities and obligations of United States government corporations and agencies |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 217.9 |  | 214.8 |  |  |
Gross unrealized gains | 0.0 |  | 0.0 |  |  |
Gross unrealized losses | (29.7) |  | (28.6) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 188.2 |  | 186.2 |  |  |
States and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 3,342.3 |  | 3,261.9 |  |  |
Gross unrealized gains | 18.2 |  | 12.2 |  |  |
Gross unrealized losses | (423.6) |  | (436.4) |  |  |
Allowance for credit losses | (2.9) |  | (3.4) |  |  |
Estimated fair value | 2,934.0 |  | 2,834.3 |  |  |
Foreign governments |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 113.6 |  | 107.2 |  |  |
Gross unrealized gains | 0.5 |  | 0.1 |  |  |
Gross unrealized losses | (13.8) |  | (15.3) |  |  |
Allowance for credit losses | (0.8) |  | (0.9) |  |  |
Estimated fair value | 99.5 |  | 91.1 |  |  |
Asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 1,593.0 |  | 1,574.6 |  |  |
Gross unrealized gains | 10.3 |  | 8.3 |  |  |
Gross unrealized losses | (51.9) |  | (66.4) |  |  |
Allowance for credit losses | (0.1) |  | (0.1) |  |  |
Estimated fair value | 1,551.3 |  | 1,516.4 |  |  |
Agency residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 910.7 |  | 819.8 |  |  |
Gross unrealized gains | 9.7 |  | 5.3 |  |  |
Gross unrealized losses | (1.3) |  | (5.5) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 919.1 |  | 819.6 |  |  |
Non-agency residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 1,608.0 |  | 1,636.3 |  |  |
Gross unrealized gains | 36.8 |  | 33.6 |  |  |
Gross unrealized losses | (108.6) |  | (130.8) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 1,536.2 |  | 1,539.1 |  |  |
Collateralized loan obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 1,091.7 |  | 1,015.2 |  |  |
Gross unrealized gains | 3.8 |  | 5.6 |  |  |
Gross unrealized losses | (5.0) |  | (4.0) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 1,090.5 |  | 1,016.8 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 2,292.7 |  | 2,379.1 |  |  |
Gross unrealized gains | 5.2 |  | 3.7 |  |  |
Gross unrealized losses | (144.9) |  | (183.7) |  |  |
Allowance for credit losses | (2.2) |  | (1.6) |  |  |
Estimated fair value | 2,150.8 |  | 2,197.5 |  |  |
Total fixed maturities, available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 25,228.8 |  | 25,151.0 |  |  |
Gross unrealized gains | 197.1 |  | 147.3 |  |  |
Gross unrealized losses | (2,339.8) |  | (2,531.1) |  |  |
Allowance for credit losses | (39.1) |  | (37.1) |  |  |
Estimated fair value | $ 23,047.0 |  | $ 22,730.1 |  |  |

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