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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)