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INVESTMENTS - SUMMARY OF INVESTMENTS WITH UNREALIZED LOSSES BY INVESTMENT CATEGORY (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair value    
Less than 12 months $ 597.9 $ 1,169.9
12 months or greater 10,076.8 10,886.4
Total 10,674.7 12,056.3
Unrealized losses    
Less than 12 months (3.4) (24.5)
12 months or greater (1,099.3) (1,365.0)
Total (1,102.7) (1,389.5)
Corporate securities    
Fair value    
Less than 12 months 134.4 332.0
12 months or greater 5,074.8 5,199.0
Total 5,209.2 5,531.0
Unrealized losses    
Less than 12 months (0.7) (5.3)
12 months or greater (562.6) (640.6)
Total (563.3) (645.9)
United States Treasury securities and obligations of United States government corporations and agencies    
Fair value    
Less than 12 months 0.0 126.7
12 months or greater 157.6 34.5
Total 157.6 161.2
Unrealized losses    
Less than 12 months 0.0 (10.2)
12 months or greater (11.6) (3.1)
Total (11.6) (13.3)
States and political subdivisions    
Fair value    
Less than 12 months 43.9 236.9
12 months or greater 1,175.2 990.0
Total 1,219.1 1,226.9
Unrealized losses    
Less than 12 months (0.4) (3.8)
12 months or greater (183.2) (181.2)
Total (183.6) (185.0)
Foreign governments    
Fair value    
Less than 12 months 1.3 6.2
12 months or greater 16.3 21.1
Total 17.6 27.3
Unrealized losses    
Less than 12 months 0.0 0.0
12 months or greater (2.0) (2.3)
Total (2.0) (2.3)
Asset-backed securities    
Fair value    
Less than 12 months 61.4 46.9
12 months or greater 860.5 1,066.8
Total 921.9 1,113.7
Unrealized losses    
Less than 12 months (0.6) (0.8)
12 months or greater (55.9) (106.0)
Total (56.5) (106.8)
Agency residential mortgage-backed securities    
Fair value    
Less than 12 months 9.3 73.4
12 months or greater 3.2 7.1
Total 12.5 80.5
Unrealized losses    
Less than 12 months 0.0 (0.4)
12 months or greater 0.0 (0.1)
Total 0.0 (0.5)
Non-agency residential mortgage-backed securities    
Fair value    
Less than 12 months 23.8 69.0
12 months or greater 935.2 1,062.9
Total 959.0 1,131.9
Unrealized losses    
Less than 12 months (0.2) (1.3)
12 months or greater (104.0) (151.4)
Total (104.2) (152.7)
Collateralized loan obligations    
Fair value    
Less than 12 months 237.0 75.0
12 months or greater 115.1 590.9
Total 352.1 665.9
Unrealized losses    
Less than 12 months (1.2) (0.3)
12 months or greater (4.3) (12.7)
Total (5.5) (13.0)
Commercial mortgage-backed securities    
Fair value    
Less than 12 months 86.8 203.8
12 months or greater 1,738.9 1,914.1
Total 1,825.7 2,117.9
Unrealized losses    
Less than 12 months (0.3) (2.4)
12 months or greater (175.7) (267.6)
Total $ (176.0) $ (270.0)