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Investments - Investment Portfolio by Major Security Type (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 70,401.6 | $ 64,231.8 | $ 58,979.0
Gross Unrealized Gains | 106.1 | 312.2 | 16.8
Gross Unrealized Losses | (2,267.4) | (2,346.8) | (3,367.6)
Net Holding Period Gains (Losses) | (18.6) | (29.1) | (55.8)
Total available-for-sale securities | $ 68,221.7 | $ 62,168.1 | $ 55,572.4
% of Total Fair Value | 94.20% | 94.20% | 93.80%
Equity securities, at Fair Value |  |  |
Cost | $ 1,594.7 | $ 1,683.1 | $ 1,769.1
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0 | 0.0
Net Holding Period Gains (Losses) | 2,539.1 | 2,147.4 | 1,924.1
Fair Value | $ 4,133.8 | $ 3,830.5 | $ 3,693.2
% of Total Fair Value | 5.80% | 5.80% | 6.20%
Debt and Equity Securities, at Fair Value |  |  |
Cost | $ 71,996.3 | $ 65,914.9 | $ 60,748.1
Gross Unrealized Gains | 106.1 | 312.2 | 16.8
Gross Unrealized Losses | (2,267.4) | (2,346.8) | (3,367.6)
Net Holding Period Gains (Losses) | 2,520.5 | 2,118.3 | 1,868.3
Fair Value | $ 72,355.5 | $ 65,998.6 | $ 59,265.6
% of Total Fair Value | 100.00% | 100.00% | 100.00%
Unsettled security transactions, payable | $ 74.1 |  | $ 248.0
Other receivable from broker-dealer and clearing organization |  | $ 45.6 |
Total fair value of non-insurance subsidiary portfolio | 4,100.0 | 4,200.0 | 4,300.0
Nonredeemable preferred stocks |  |  |
Equity securities, at Fair Value |  |  |
Cost | 886.9 | 977.1 | 1,107.1
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0 | 0.0
Net Holding Period Gains (Losses) | (48.7) | (75.0) | (122.0)
Fair Value | $ 838.2 | $ 902.1 | $ 985.1
% of Total Fair Value | 1.20% | 1.40% | 1.60%
Common equities |  |  |
Equity securities, at Fair Value |  |  |
Cost | $ 707.8 | $ 706.0 | $ 662.0
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0 | 0.0
Net Holding Period Gains (Losses) | 2,587.8 | 2,222.4 | 2,046.1
Fair Value | $ 3,295.6 | $ 2,928.4 | $ 2,708.1
% of Total Fair Value | 4.60% | 4.40% | 4.60%
Total fixed maturities |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 69,668.2 | $ 62,441.9 | $ 57,484.7
Gross Unrealized Gains | 106.1 | 312.2 | 16.8
Gross Unrealized Losses | (2,267.4) | (2,346.8) | (3,367.6)
Net Holding Period Gains (Losses) | (18.6) | (29.1) | (55.8)
Total available-for-sale securities | $ 67,488.3 | $ 60,378.2 | $ 54,078.1
% of Total Fair Value | 93.20% | 91.50% | 91.30%
Total fixed maturities | U.S. government obligations |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 42,063.1 | $ 37,823.2 | $ 33,277.1
Gross Unrealized Gains | 59.6 | 204.1 | 0.1
Gross Unrealized Losses | (1,228.7) | (1,157.9) | (1,676.7)
Net Holding Period Gains (Losses) | 0.0 | 0.0 | 0.0
Total available-for-sale securities | $ 40,894.0 | $ 36,869.4 | $ 31,600.5
% of Total Fair Value | 56.50% | 55.90% | 53.30%
Total fixed maturities | State and local government obligations |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 2,345.6 | $ 2,338.4 | $ 2,336.5
Gross Unrealized Gains | 0.7 | 2.8 | 0.1
Gross Unrealized Losses | (144.3) | (138.4) | (181.9)
Net Holding Period Gains (Losses) | 0.0 | 0.0 | 0.0
Total available-for-sale securities | $ 2,202.0 | $ 2,202.8 | $ 2,154.7
% of Total Fair Value | 3.00% | 3.30% | 3.60%
Total fixed maturities | Foreign government obligations |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 16.7 | $ 17.3 | $ 17.2
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | (0.9) | (1.0) | (1.4)
Net Holding Period Gains (Losses) | 0.0 | 0.0 | 0.0
Total available-for-sale securities | $ 15.8 | $ 16.3 | $ 15.8
% 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 | $ 13,260.0 | $ 11,446.0 | $ 10,866.4
Gross Unrealized Gains | 33.6 | 87.2 | 14.4
Gross Unrealized Losses | (303.8) | (332.3) | (540.3)
Net Holding Period Gains (Losses) | (15.2) | (17.2) | (35.9)
Total available-for-sale securities | $ 12,974.6 | $ 11,183.7 | $ 10,304.6
% of Total Fair Value | 17.90% | 16.90% | 17.40%
Total fixed maturities | Residential mortgage-backed securities |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 980.4 | $ 426.9 | $ 580.7
Gross Unrealized Gains | 2.6 | 0.2 | 0.2
Gross Unrealized Losses | (9.4) | (10.0) | (13.0)
Net Holding Period Gains (Losses) | 2.1 | 0.1 | (5.2)
Total available-for-sale securities | $ 975.7 | $ 417.2 | $ 562.7
% of Total Fair Value | 1.30% | 0.60% | 0.90%
Total fixed maturities | Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 4,457.2 | $ 4,535.2 | $ 4,982.2
Gross Unrealized Gains | 1.9 | 2.2 | 2.0
Gross Unrealized Losses | (489.1) | (597.7) | (718.7)
Net Holding Period Gains (Losses) | 0.0 | 0.0 | 0.0
Total available-for-sale securities | $ 3,970.0 | $ 3,939.7 | $ 4,265.5
% of Total Fair Value | 5.50% | 6.00% | 7.20%
Total fixed maturities | Other asset-backed securities |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 6,366.4 | $ 5,667.2 | $ 5,250.6
Gross Unrealized Gains | 7.7 | 15.7 | 0.0
Gross Unrealized Losses | (89.3) | (107.1) | (232.0)
Net Holding Period Gains (Losses) | (0.1) | (0.4) | (1.0)
Total available-for-sale securities | $ 6,284.7 | $ 5,575.4 | $ 5,017.6
% of Total Fair Value | 8.70% | 8.40% | 8.50%
Total fixed maturities | Redeemable preferred stocks |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 178.8 | $ 187.7 | $ 174.0
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | (1.9) | (2.4) | (3.6)
Net Holding Period Gains (Losses) | (5.4) | (11.6) | (13.7)
Total available-for-sale securities | $ 171.5 | $ 173.7 | $ 156.7
% of Total Fair Value | 0.20% | 0.30% | 0.30%
Short-term investments |  |  |
Debt Securities, Available-for-Sale, at Fair Value |  |  |
Cost | $ 733.4 | $ 1,789.9 | $ 1,494.3
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 | $ 733.4 | $ 1,789.9 | $ 1,494.3
% of Total Fair Value | 1.00% | 2.70% | 2.50%

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