XML 78 R59.htm IDEA: XBRL DOCUMENT v3.22.4
Investments Investment Portfolio by Major Security Type (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Available-for-sale securities, at fair value:    
Cost $ 53,125.7 $ 44,736.8
Gross Unrealized Gains 13.9 387.4
Gross Unrealized Losses (3,551.5) (316.0)
Net Holding Period Gains (Losses) (74.5) 7.5
Fair Value $ 49,513.6 $ 44,815.7
% of Total Fair Value 92.50% 87.00%
Equity securities, at fair value:    
Cost $ 2,190.3 $ 2,835.9
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Holding Period Gains (Losses) 1,844.4 3,862.5
Fair Value $ 4,034.7 $ 6,698.4
% of Total Fair Value 7.50% 13.00%
Debt and Equity Securities, at Fair Value    
Cost $ 55,316.0 $ 47,572.7
Gross Unrealized Gains 13.9 387.4
Gross Unrealized Losses (3,551.5) (316.0)
Net Holding Period Gains (Losses) 1,769.9 3,870.0
Fair value $ 53,548.3 $ 51,514.1
% of Total Fair Value 100.00% 100.00%
Other Receivable from Broker-Dealer and Clearing Organization $ 34.4  
Other Payables to Broker-Dealers and Clearing Organizations   $ 143.4
Securities held in consolidated non-insurance subsidiary 4,400.0 4,200.0
Nonredeemable preferred stocks    
Equity securities, at fair value:    
Cost 1,364.2 1,571.8
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Holding Period Gains (Losses) (151.0) 68.1
Fair Value $ 1,213.2 $ 1,639.9
% of Total Fair Value 2.30% 3.20%
Common equities    
Equity securities, at fair value:    
Cost $ 826.1 $ 1,264.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Holding Period Gains (Losses) 1,995.4 3,794.4
Fair Value $ 2,821.5 $ 5,058.5
% of Total Fair Value 5.20% 9.80%
Fixed maturities    
Available-for-sale securities, at fair value:    
Cost $ 50,264.0 $ 43,794.2
Gross Unrealized Gains 13.9 387.4
Gross Unrealized Losses (3,551.5) (316.0)
Net Holding Period Gains (Losses) (74.5) 7.5
Fair Value $ 46,651.9 $ 43,873.1
% of Total Fair Value 87.10% 85.20%
Fixed maturities | U.S. government obligations    
Available-for-sale securities, at fair value:    
Cost $ 26,770.7 $ 18,586.1
Gross Unrealized Gains 1.4 92.9
Gross Unrealized Losses (1,604.7) (190.8)
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 25,167.4 $ 18,488.2
% of Total Fair Value 47.00% 35.90%
Fixed maturities | State and local government obligations    
Available-for-sale securities, at fair value:    
Cost $ 2,180.0 $ 2,162.6
Gross Unrealized Gains 0.0 36.7
Gross Unrealized Losses (202.9) (14.0)
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 1,977.1 $ 2,185.3
% of Total Fair Value 3.70% 4.20%
Fixed maturities | Foreign government obligations    
Available-for-sale securities, at fair value:    
Cost $ 16.8 $ 17.9
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (1.3) 0.0
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 15.5 $ 17.9
% of Total Fair Value 0.10% 0.10%
Fixed maturities | Corporate debt securities    
Available-for-sale securities, at fair value:    
Cost $ 10,125.8 $ 10,526.2
Gross Unrealized Gains 9.8 202.6
Gross Unrealized Losses (676.1) (33.4)
Net Holding Period Gains (Losses) (46.8) (3.3)
Fair Value $ 9,412.7 $ 10,692.1
% of Total Fair Value 17.60% 20.70%
Fixed maturities | Residential mortgage-backed securities    
Available-for-sale securities, at fair value:    
Cost $ 696.1 $ 787.7
Gross Unrealized Gains 0.3 2.3
Gross Unrealized Losses (17.5) (0.6)
Net Holding Period Gains (Losses) (12.1) 0.6
Fair Value $ 666.8 $ 790.0
% of Total Fair Value 1.20% 1.50%
Fixed maturities | Commercial mortgage-backed securities    
Available-for-sale securities, at fair value:    
Cost $ 5,446.0 $ 6,561.0
Gross Unrealized Gains 1.5 38.9
Gross Unrealized Losses (784.0) (64.3)
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 4,663.5 $ 6,535.6
% of Total Fair Value 8.70% 12.70%
Fixed maturities | Other asset-backed securities    
Available-for-sale securities, at fair value:    
Cost $ 4,826.0 $ 4,981.8
Gross Unrealized Gains 0.9 13.3
Gross Unrealized Losses (260.5) (12.4)
Net Holding Period Gains (Losses) (1.8) (0.4)
Fair Value $ 4,564.6 $ 4,982.3
% of Total Fair Value 8.50% 9.70%
Fixed maturities | Redeemable preferred stocks    
Available-for-sale securities, at fair value:    
Cost $ 202.6 $ 170.9
Gross Unrealized Gains 0.0 0.7
Gross Unrealized Losses (4.5) (0.5)
Net Holding Period Gains (Losses) (13.8) 10.6
Fair Value $ 184.3 $ 181.7
% of Total Fair Value 0.30% 0.40%
Short-term investments    
Available-for-sale securities, at fair value:    
Cost $ 2,861.7 $ 942.6
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 2,861.7 $ 942.6
% of Total Fair Value 5.40% 1.80%