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INVESTMENTS - SCHEDULE OF UNREALIZED LOSS ON INVESTMENTS (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value |  |
Less than 12 months | $ 2,982.0 | $ 1,169.9
12 months or greater | 8,488.3 | 10,886.4
Total | 11,470.3 | 12,056.3
Unrealized losses |  |
Less than 12 months | (70.7) | (24.5)
12 months or greater | (1,358.4) | (1,365.0)
Total | (1,429.1) | (1,389.5)
Corporate securities |  |
Fair value |  |
Less than 12 months | 1,200.7 | 332.0
12 months or greater | 4,035.6 | 5,199.0
Total | 5,236.3 | 5,531.0
Unrealized losses |  |
Less than 12 months | (35.5) | (5.3)
12 months or greater | (740.7) | (640.6)
Total | (776.2) | (645.9)
United States Treasury securities and obligations of United States government corporations and agencies |  |
Fair value |  |
Less than 12 months | 44.7 | 126.7
12 months or greater | 141.5 | 34.5
Total | 186.2 | 161.2
Unrealized losses |  |
Less than 12 months | (3.8) | (10.2)
12 months or greater | (24.8) | (3.1)
Total | (28.6) | (13.3)
States and political subdivisions |  |
Fair value |  |
Less than 12 months | 831.9 | 236.9
12 months or greater | 896.1 | 990.0
Total | 1,728.0 | 1,226.9
Unrealized losses |  |
Less than 12 months | (20.5) | (3.8)
12 months or greater | (212.1) | (181.2)
Total | (232.6) | (185.0)
Foreign governments |  |
Fair value |  |
Less than 12 months | 17.4 | 6.2
12 months or greater | 10.0 | 21.1
Total | 27.4 | 27.3
Unrealized losses |  |
Less than 12 months | (1.0) | 0.0
12 months or greater | (1.1) | (2.3)
Total | (2.1) | (2.3)
Asset-backed securities |  |
Fair value |  |
Less than 12 months | 124.8 | 46.9
12 months or greater | 807.9 | 1,066.8
Total | 932.7 | 1,113.7
Unrealized losses |  |
Less than 12 months | (1.3) | (0.8)
12 months or greater | (64.3) | (106.0)
Total | (65.6) | (106.8)
Agency residential mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 297.1 | 73.4
12 months or greater | 3.1 | 7.1
Total | 300.2 | 80.5
Unrealized losses |  |
Less than 12 months | (5.3) | (0.4)
12 months or greater | (0.2) | (0.1)
Total | (5.5) | (0.5)
Non-agency residential mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 128.0 | 69.0
12 months or greater | 884.6 | 1,062.9
Total | 1,012.6 | 1,131.9
Unrealized losses |  |
Less than 12 months | (1.4) | (1.3)
12 months or greater | (129.4) | (151.4)
Total | (130.8) | (152.7)
Collateralized loan obligations |  |
Fair value |  |
Less than 12 months | 162.9 | 75.0
12 months or greater | 66.8 | 590.9
Total | 229.7 | 665.9
Unrealized losses |  |
Less than 12 months | (0.7) | (0.3)
12 months or greater | (3.3) | (12.7)
Total | (4.0) | (13.0)
Commercial mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 174.5 | 203.8
12 months or greater | 1,642.7 | 1,914.1
Total | 1,817.2 | 2,117.9
Unrealized losses |  |
Less than 12 months | (1.2) | (2.4)
12 months or greater | (182.5) | (267.6)
Total | $ (183.7) | $ (270.0)

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