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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)