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INVESTMENTS - SUMMARY OF INVESTMENTS WITH UNREALIZED LOSSES BY INVESTMENT CATEGORY (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair value    
Less than 12 months $ 2,107.0 $ 2,982.1
12 months or greater 6,828.3 8,482.0
Total 8,935.3 11,464.1
Unrealized losses    
Less than 12 months (45.3) (70.6)
12 months or greater (986.5) (1,357.8)
Total (1,031.8) (1,428.4)
Corporate securities    
Fair value    
Less than 12 months 622.2 1,200.8
12 months or greater 2,889.8 4,029.2
Total 3,512.0 5,230.0
Unrealized losses    
Less than 12 months (21.6) (35.5)
12 months or greater (497.2) (740.3)
Total (518.8) (775.8)
United States Treasury securities and obligations of United States government corporations and agencies    
Fair value    
Less than 12 months 39.0 44.7
12 months or greater 144.3 141.5
Total 183.3 186.2
Unrealized losses    
Less than 12 months (5.4) (3.8)
12 months or greater (24.4) (24.8)
Total (29.8) (28.6)
States and political subdivisions    
Fair value    
Less than 12 months 631.9 831.9
12 months or greater 747.3 896.1
Total 1,379.2 1,728.0
Unrealized losses    
Less than 12 months (12.2) (20.5)
12 months or greater (158.8) (212.1)
Total (171.0) (232.6)
Foreign governments    
Fair value    
Less than 12 months 19.9 17.4
12 months or greater 8.6 10.0
Total 28.5 27.4
Unrealized losses    
Less than 12 months (0.7) (1.0)
12 months or greater (1.0) (1.0)
Total (1.7) (2.0)
Asset-backed securities    
Fair value    
Less than 12 months 80.7 124.8
12 months or greater 698.0 807.9
Total 778.7 932.7
Unrealized losses    
Less than 12 months (0.7) (1.2)
12 months or greater (49.9) (64.3)
Total (50.6) (65.5)
Agency residential mortgage-backed securities    
Fair value    
Less than 12 months 176.5 297.1
12 months or greater 3.0 3.1
Total 179.5 300.2
Unrealized losses    
Less than 12 months (1.3) (5.3)
12 months or greater 0.0 (0.2)
Total (1.3) (5.5)
Non-agency residential mortgage-backed securities    
Fair value    
Less than 12 months 57.7 128.0
12 months or greater 829.3 884.6
Total 887.0 1,012.6
Unrealized losses    
Less than 12 months (0.6) (1.4)
12 months or greater (108.1) (129.4)
Total (108.7) (130.8)
Collateralized loan obligations    
Fair value    
Less than 12 months 316.4 162.9
12 months or greater 71.3 66.9
Total 387.7 229.8
Unrealized losses    
Less than 12 months (2.0) (0.7)
12 months or greater (3.0) (3.2)
Total (5.0) (3.9)
Commercial mortgage-backed securities    
Fair value    
Less than 12 months 162.7 174.5
12 months or greater 1,436.7 1,642.7
Total 1,599.4 1,817.2
Unrealized losses    
Less than 12 months (0.8) (1.2)
12 months or greater (144.1) (182.5)
Total $ (144.9) $ (183.7)