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Investments - Investment Portfolio by Major Security Type (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 62,285.8 | $ 53,125.7 | $ 52,443.3
Gross Unrealized Gains | 3.7 | 13.9 | 1.8
Gross Unrealized Losses | (3,846.3) | (3,551.5) | (3,943.1)
Net Holding Period Gains (Losses) | (56.1) | (74.5) | (91.3)
Total available-for-sale securities | $ 58,387.1 | $ 49,513.6 | $ 48,410.7
% of Total Fair Value | 94.40% | 92.50% | 92.50%
Equity securities, at Fair Value |  |  |
Cost | $ 1,639.5 | $ 2,190.3 | $ 2,221.3
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0 | 0.0
Net Holding Period Gains (Losses) | 1,843.9 | 1,844.4 | 1,698.4
Fair Value | $ 3,483.4 | $ 4,034.7 | $ 3,919.7
% of Total Fair Value | 5.60% | 7.50% | 7.50%
Debt and Equity Securities, at Fair Value |  |  |
Cost | $ 63,925.3 | $ 55,316.0 | $ 54,664.6
Gross Unrealized Gains | 3.7 | 13.9 | 1.8
Gross Unrealized Losses | (3,846.3) | (3,551.5) | (3,943.1)
Net Holding Period Gains (Losses) | 1,787.8 | 1,769.9 | 1,607.1
Fair Value | $ 61,870.5 | $ 53,548.3 | $ 52,330.4
% of Total Fair Value | 100.00% | 100.00% | 100.00%
Unsettled security transactions, payable | $ 167.3 |  | $ 74.7
Other receivable from broker-dealer and clearing organization |  | $ 34.4 |
Total fair value of non-insurance subsidiary portfolio | 4,100.0 | 4,400.0 | 4,200.0
Nonredeemable preferred stocks |  |  |
Equity securities, at Fair Value |  |  |
Cost | 976.9 | 1,364.2 | 1,417.6
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0 | 0.0
Net Holding Period Gains (Losses) | (108.0) | (151.0) | (163.2)
Fair Value | $ 868.9 | $ 1,213.2 | $ 1,254.4
% of Total Fair Value | 1.40% | 2.30% | 2.40%
Common equities |  |  |
Equity securities, at Fair Value |  |  |
Cost | $ 662.6 | $ 826.1 | $ 803.7
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0 | 0.0
Net Holding Period Gains (Losses) | 1,951.9 | 1,995.4 | 1,861.6
Fair Value | $ 2,614.5 | $ 2,821.5 | $ 2,665.3
% of Total Fair Value | 4.20% | 5.20% | 5.10%
Total fixed maturities |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 60,490.6 | $ 50,264.0 | $ 48,205.7
Gross Unrealized Gains | 3.7 | 13.9 | 1.8
Gross Unrealized Losses | (3,846.3) | (3,551.5) | (3,943.1)
Net Holding Period Gains (Losses) | (56.1) | (74.5) | (91.3)
Total available-for-sale securities | $ 56,591.9 | $ 46,651.9 | $ 44,173.1
% of Total Fair Value | 91.50% | 87.10% | 84.40%
Total fixed maturities | U.S. government obligations |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 36,392.2 | $ 26,770.7 | $ 24,260.9
Gross Unrealized Gains | 0.0 | 1.4 | 0.0
Gross Unrealized Losses | (2,098.4) | (1,604.7) | (1,855.4)
Net Holding Period Gains (Losses) | 0.0 | 0.0 | 0.0
Total available-for-sale securities | $ 34,293.8 | $ 25,167.4 | $ 22,405.5
% of Total Fair Value | 55.40% | 47.00% | 42.80%
Total fixed maturities | State and local government obligations |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 2,257.6 | $ 2,180.0 | $ 2,140.9
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | (203.3) | (202.9) | (215.4)
Net Holding Period Gains (Losses) | 0.0 | 0.0 | 0.0
Total available-for-sale securities | $ 2,054.3 | $ 1,977.1 | $ 1,925.5
% of Total Fair Value | 3.30% | 3.70% | 3.70%
Total fixed maturities | Foreign government obligations |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 16.9 | $ 16.8 | $ 16.7
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | (1.5) | (1.3) | (1.4)
Net Holding Period Gains (Losses) | 0.0 | 0.0 | 0.0
Total available-for-sale securities | $ 15.4 | $ 15.5 | $ 15.3
% of Total Fair Value | 0.10% | 0.10% | 0.10%
Total fixed maturities | Corporate debt securities |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 10,880.8 | $ 10,125.8 | $ 10,119.8
Gross Unrealized Gains | 1.3 | 9.8 | 0.0
Gross Unrealized Losses | (591.8) | (676.1) | (832.5)
Net Holding Period Gains (Losses) | (36.1) | (46.8) | (58.9)
Total available-for-sale securities | $ 10,254.2 | $ 9,412.7 | $ 9,228.4
% of Total Fair Value | 16.60% | 17.60% | 17.60%
Total fixed maturities | Residential mortgage-backed securities |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 530.4 | $ 696.1 | $ 754.2
Gross Unrealized Gains | 0.2 | 0.3 | 0.4
Gross Unrealized Losses | (13.0) | (17.5) | (16.5)
Net Holding Period Gains (Losses) | (1.8) | (12.1) | (15.1)
Total available-for-sale securities | $ 515.8 | $ 666.8 | $ 723.0
% of Total Fair Value | 0.80% | 1.20% | 1.40%
Total fixed maturities | Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 4,699.5 | $ 5,446.0 | $ 5,833.9
Gross Unrealized Gains | 2.1 | 1.5 | 1.4
Gross Unrealized Losses | (723.9) | (784.0) | (747.4)
Net Holding Period Gains (Losses) | 0.0 | 0.0 | 0.0
Total available-for-sale securities | $ 3,977.7 | $ 4,663.5 | $ 5,087.9
% of Total Fair Value | 6.40% | 8.70% | 9.70%
Total fixed maturities | Other asset-backed securities |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 5,524.2 | $ 4,826.0 | $ 4,876.7
Gross Unrealized Gains | 0.1 | 0.9 | 0.0
Gross Unrealized Losses | (210.1) | (260.5) | (268.9)
Net Holding Period Gains (Losses) | (0.6) | (1.8) | (1.9)
Total available-for-sale securities | $ 5,313.6 | $ 4,564.6 | $ 4,605.9
% of Total Fair Value | 8.60% | 8.50% | 8.80%
Total fixed maturities | Redeemable preferred stocks |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 189.0 | $ 202.6 | $ 202.6
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | (4.3) | (4.5) | (5.6)
Net Holding Period Gains (Losses) | (17.6) | (13.8) | (15.4)
Total available-for-sale securities | $ 167.1 | $ 184.3 | $ 181.6
% of Total Fair Value | 0.30% | 0.30% | 0.30%
Short-term investments |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 1,795.2 | $ 2,861.7 | $ 4,237.6
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0 | 0.0
Net Holding Period Gains (Losses) | 0.0 | 0.0 | 0.0
Total available-for-sale securities | $ 1,795.2 | $ 2,861.7 | $ 4,237.6
% of Total Fair Value | 2.90% | 5.40% | 8.10%

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