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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)