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INVESTMENTS - SUMMARY OF INVESTMENTS WITH UNREALIZED LOSSES BY INVESTMENT CATEGORY (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value |  |
Less than 12 months | $ 2,246.0 | $ 1,169.9
12 months or greater | 10,191.3 | 10,886.4
Total | 12,437.3 | 12,056.3
Unrealized losses |  |
Less than 12 months | (28.7) | (24.5)
12 months or greater | (1,403.7) | (1,365.0)
Total | (1,432.4) | (1,389.5)
Corporate securities |  |
Fair value |  |
Less than 12 months | 687.8 | 332.0
12 months or greater | 4,836.0 | 5,199.0
Total | 5,523.8 | 5,531.0
Unrealized losses |  |
Less than 12 months | (13.7) | (5.3)
12 months or greater | (722.8) | (640.6)
Total | (736.5) | (645.9)
United States Treasury securities and obligations of United States government corporations and agencies |  |
Fair value |  |
Less than 12 months | 97.6 | 126.7
12 months or greater | 153.4 | 34.5
Total | 251.0 | 161.2
Unrealized losses |  |
Less than 12 months | 0.0 | (10.2)
12 months or greater | (22.1) | (3.1)
Total | (22.1) | (13.3)
States and political subdivisions |  |
Fair value |  |
Less than 12 months | 367.2 | 236.9
12 months or greater | 1,155.2 | 990.0
Total | 1,522.4 | 1,226.9
Unrealized losses |  |
Less than 12 months | (5.2) | (3.8)
12 months or greater | (207.9) | (181.2)
Total | (213.1) | (185.0)
Foreign governments |  |
Fair value |  |
Less than 12 months | 20.3 | 6.2
12 months or greater | 21.6 | 21.1
Total | 41.9 | 27.3
Unrealized losses |  |
Less than 12 months | (0.7) | 0.0
12 months or greater | (2.0) | (2.3)
Total | (2.7) | (2.3)
Asset-backed securities |  |
Fair value |  |
Less than 12 months | 180.0 | 46.9
12 months or greater | 958.6 | 1,066.8
Total | 1,138.6 | 1,113.7
Unrealized losses |  |
Less than 12 months | (1.3) | (0.8)
12 months or greater | (85.5) | (106.0)
Total | (86.8) | (106.8)
Agency residential mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 272.9 | 73.4
12 months or greater | 43.7 | 7.1
Total | 316.6 | 80.5
Unrealized losses |  |
Less than 12 months | (2.8) | (0.4)
12 months or greater | (1.2) | (0.1)
Total | (4.0) | (0.5)
Non-agency residential mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 130.8 | 69.0
12 months or greater | 1,029.2 | 1,062.9
Total | 1,160.0 | 1,131.9
Unrealized losses |  |
Less than 12 months | (1.6) | (1.3)
12 months or greater | (143.2) | (151.4)
Total | (144.8) | (152.7)
Collateralized loan obligations |  |
Fair value |  |
Less than 12 months | 278.8 | 75.0
12 months or greater | 224.9 | 590.9
Total | 503.7 | 665.9
Unrealized losses |  |
Less than 12 months | (2.3) | (0.3)
12 months or greater | (5.5) | (12.7)
Total | (7.8) | (13.0)
Commercial mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 210.6 | 203.8
12 months or greater | 1,768.7 | 1,914.1
Total | 1,979.3 | 2,117.9
Unrealized losses |  |
Less than 12 months | (1.1) | (2.4)
12 months or greater | (213.5) | (267.6)
Total | $ (214.6) | $ (270.0)

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