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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 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | $ 25,246.4 |  |  |  |  |
Allowance for credit losses | (25.9) | $ (39.8) | $ (42.9) | $ (69.4) | $ (66.1) | $ (56.0)
Estimated fair value | 23,724.7 |  | 21,506.2 |  |  |
Corporate securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 13,725.2 |  | 13,186.9 |  |  |
Gross unrealized gains | 159.0 |  | 74.7 |  |  |
Gross unrealized losses | (1,131.0) |  | (1,382.4) |  |  |
Allowance for credit losses | (24.5) | (38.6) | (41.7) | (66.8) | (64.4) | (54.4)
Estimated fair value | 12,728.7 |  | 11,837.5 |  |  |
Certificates of deposit |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 470.0 |  |  |  |  |
Gross unrealized gains | 13.1 |  |  |  |  |
Gross unrealized losses | 0.0 |  |  |  |  |
Allowance for credit losses | 0.0 |  |  |  |  |
Estimated fair value | 483.1 |  |  |  |  |
United States Treasury securities and obligations of United States government corporations and agencies |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 210.8 |  | 207.6 |  |  |
Gross unrealized gains | 0.1 |  | 0.1 |  |  |
Gross unrealized losses | (11.6) |  | (13.3) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 199.3 |  | 194.4 |  |  |
States and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 3,223.2 |  | 2,896.8 |  |  |
Gross unrealized gains | 46.3 |  | 31.3 |  |  |
Gross unrealized losses | (301.0) |  | (360.7) |  |  |
Allowance for credit losses | (0.8) | (0.6) | (0.7) | (1.7) | (1.0) | (0.9)
Estimated fair value | 2,967.7 |  | 2,566.7 |  |  |
Foreign governments |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 103.2 |  | 92.7 |  |  |
Gross unrealized gains | 1.6 |  | 1.2 |  |  |
Gross unrealized losses | (9.6) |  | (10.4) |  |  |
Allowance for credit losses | (0.5) | (0.5) | (0.4) | (0.7) | (0.5) | (0.4)
Estimated fair value | 94.7 |  | 83.1 |  |  |
Asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 1,578.5 |  | 1,476.2 |  |  |
Gross unrealized gains | 13.7 |  | 4.1 |  |  |
Gross unrealized losses | (57.1) |  | (107.8) |  |  |
Allowance for credit losses | (0.1) | $ (0.1) | (0.1) | $ (0.2) | $ (0.2) | $ (0.3)
Estimated fair value | 1,535.0 |  | 1,372.4 |  |  |
Agency residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 812.5 |  | 639.0 |  |  |
Gross unrealized gains | 14.5 |  | 9.5 |  |  |
Gross unrealized losses | (0.1) |  | (0.5) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 826.9 |  | 648.0 |  |  |
Non-agency residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 1,670.0 |  | 1,670.1 |  |  |
Gross unrealized gains | 42.8 |  | 35.8 |  |  |
Gross unrealized losses | (104.1) |  | (152.7) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 1,608.7 |  | 1,553.2 |  |  |
Collateralized loan obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 1,083.2 |  | 1,042.5 |  |  |
Gross unrealized gains | 4.5 |  | 3.3 |  |  |
Gross unrealized losses | (5.5) |  | (13.0) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 1,082.2 |  | 1,032.8 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 2,369.8 |  | 2,487.4 |  |  |
Gross unrealized gains | 4.7 |  | 0.7 |  |  |
Gross unrealized losses | (176.1) |  | (270.0) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 2,198.4 |  | 2,218.1 |  |  |
Total fixed maturities, available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 25,246.4 |  | 23,699.2 |  |  |
Gross unrealized gains | 300.3 |  | 160.7 |  |  |
Gross unrealized losses | (1,796.1) |  | (2,310.8) |  |  |
Allowance for credit losses | (25.9) |  | (42.9) |  |  |
Estimated fair value | $ 23,724.7 |  | $ 21,506.2 |  |  |

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