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INVESTMENTS - SUMMARY OF INVESTMENTS WITH UNREALIZED LOSSES BY INVESTMENT CATEGORY (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value |  |
Less than 12 months | $ 2,212.8 | $ 7,636.9
12 months or greater | 8,074.1 | 1,897.5
Total | 10,286.9 | 9,534.4
Unrealized losses |  |
Less than 12 months | (108.1) | (835.2)
12 months or greater | (1,442.7) | (471.6)
Total | (1,550.8) | (1,306.8)
Corporate securities |  |
Fair value |  |
Less than 12 months | 591.1 | 2,830.8
12 months or greater | 2,938.4 | 370.4
Total | 3,529.5 | 3,201.2
Unrealized losses |  |
Less than 12 months | (42.3) | (329.4)
12 months or greater | (631.8) | (129.3)
Total | (674.1) | (458.7)
United States Treasury securities and obligations of United States government corporations and agencies |  |
Fair value |  |
Less than 12 months | 131.9 | 134.4
12 months or greater | 33.5 | 21.9
Total | 165.4 | 156.3
Unrealized losses |  |
Less than 12 months | (24.7) | (9.6)
12 months or greater | (4.1) | (3.4)
Total | (28.8) | (13.0)
States and political subdivisions |  |
Fair value |  |
Less than 12 months | 181.9 | 667.0
12 months or greater | 436.5 | 132.1
Total | 618.4 | 799.1
Unrealized losses |  |
Less than 12 months | (12.9) | (124.8)
12 months or greater | (145.7) | (58.5)
Total | (158.6) | (183.3)
Foreign governments |  |
Fair value |  |
Less than 12 months | 6.5 | 35.0
12 months or greater | 23.3 | 2.1
Total | 29.8 | 37.1
Unrealized losses |  |
Less than 12 months | (0.5) | (3.5)
12 months or greater | (2.8) | (0.3)
Total | (3.3) | (3.8)
Asset-backed securities |  |
Fair value |  |
Less than 12 months | 212.8 | 914.0
12 months or greater | 1,050.6 | 258.1
Total | 1,263.4 | 1,172.1
Unrealized losses |  |
Less than 12 months | (4.1) | (90.1)
12 months or greater | (133.6) | (53.4)
Total | (137.7) | (143.5)
Agency residential mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 505.8 | 59.7
12 months or greater | 7.1 | 0.0
Total | 512.9 | 59.7
Unrealized losses |  |
Less than 12 months | (12.3) | (0.7)
12 months or greater | (0.3) | 0.0
Total | (12.6) | (0.7)
Non-agency residential mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 245.1 | 861.6
12 months or greater | 1,014.5 | 335.4
Total | 1,259.6 | 1,197.0
Unrealized losses |  |
Less than 12 months | (6.6) | (89.7)
12 months or greater | (197.7) | (102.2)
Total | (204.3) | (191.9)
Collateralized loan obligations |  |
Fair value |  |
Less than 12 months | 114.4 | 553.0
12 months or greater | 642.6 | 184.2
Total | 757.0 | 737.2
Unrealized losses |  |
Less than 12 months | (0.4) | (27.4)
12 months or greater | (19.7) | (12.2)
Total | (20.1) | (39.6)
Commercial mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 223.3 | 1,581.4
12 months or greater | 1,927.6 | 593.3
Total | 2,150.9 | 2,174.7
Unrealized losses |  |
Less than 12 months | (4.3) | (160.0)
12 months or greater | (307.0) | (112.3)
Total | $ (311.3) | $ (272.3)

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