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Investments - Components of Net Realized Gains (Losses) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | $ 3.2 | $ 0.2 | $ 6.4 | $ 4.1
Gross realized gains on equity securities | 0.0 | 222.1 | 11.2 | 354.2
Subtotal gross realized gains on security sales | 3.2 | 222.3 | 17.6 | 358.3
Gross realized loss on available-for-sale securities | (225.0) | (76.9) | (379.9) | (143.6)
Gross realized loss on equity securities | (4.6) | (10.3) | (10.6) | (123.1)
Subtotal gross realized losses on security sales | (229.6) | (87.2) | (390.5) | (266.7)
Net realized gains (losses) on available-for-sale securities sales | (221.8) | (76.7) | (373.5) | (139.5)
Net realized gains (losses) on equity securities sales | (4.6) | 211.8 | 0.6 | 231.1
Subtotal net realized gains (losses) on security sales | (226.4) | 135.1 | (372.9) | 91.6
Gain | 0.0 | 0.0 | 0.0 | 13.2
Impairment | 0.0 | (2.2) | 0.0 | (4.5)
Subtotal net realized gains (losses) on other assets | 0.0 | (2.2) | 0.0 | 8.7
Hybrid securities | 3.3 | 4.8 | 10.5 | 18.7
Equity securities | 96.8 | (10.8) | 391.7 | 79.7
Subtotal net holding period gains (losses) | 100.1 | (6.0) | 402.2 | 98.4
Total net realized gains (losses) on securities | (126.3) | 126.9 | 29.3 | 198.7
U.S. government obligations |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 1.3 | 0.2 | 1.3 | 4.0
Gross realized loss on available-for-sale securities | (191.9) | (1.1) | (327.2) | (12.6)
Net realized gains (losses) on available-for-sale securities sales | (190.6) | (0.9) | (325.9) | (8.6)
State and local government obligations |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 0.0 | 0.0 | 0.3 | 0.0
Gross realized loss on available-for-sale securities | 0.0 | 0.0 | (0.1) | 0.0
Net realized gains (losses) on available-for-sale securities sales | 0.0 | 0.0 | 0.2 | 0.0
Corporate debt securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 0.7 | 0.0 | 3.6 | 0.1
Gross realized loss on available-for-sale securities | (21.6) | (29.8) | (36.4) | (50.2)
Net realized gains (losses) on available-for-sale securities sales | (20.9) | (29.8) | (32.8) | (50.1)
Residential mortgage-backed securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 1.1 | 0.0 | 1.1 | 0.0
Net realized gains (losses) on available-for-sale securities sales | 1.1 | 0.0 | 1.1 | 0.0
Commercial mortgage-backed securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized loss on available-for-sale securities | (10.7) | (45.5) | (15.0) | (80.0)
Net realized gains (losses) on available-for-sale securities sales | (10.7) | (45.5) | (15.0) | (80.0)
Other asset-backed securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 0.1 | 0.0 | 0.1 | 0.0
Gross realized loss on available-for-sale securities | 0.0 | (0.2) | (0.1) | (0.4)
Net realized gains (losses) on available-for-sale securities sales | 0.1 | (0.2) | 0.0 | (0.4)
Redeemable preferred stocks |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized loss on available-for-sale securities |  |  | (1.1) | 0.0
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment | (0.8) | 0.0 |  |
Net realized gains (losses) on available-for-sale securities sales | (0.8) | 0.0 | (1.1) | 0.0
Short-term investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized loss on available-for-sale securities | 0.0 | (0.3) | 0.0 | (0.4)
Net realized gains (losses) on available-for-sale securities sales | 0.0 | (0.3) | 0.0 | (0.4)
Nonredeemable preferred stocks |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on equity securities | 0.0 | 0.2 | 0.0 | 0.3
Gross realized loss on equity securities | (4.6) | (9.2) | (10.5) | (110.2)
Net realized gains (losses) on equity securities sales | (4.6) | (9.0) | (10.5) | (109.9)
Common equities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on equity securities | 0.0 | 221.9 | 11.2 | 353.9
Gross realized loss on equity securities | 0.0 | (1.1) | (0.1) | (12.9)
Net realized gains (losses) on equity securities sales | $ 0.0 | $ 220.8 | $ 11.1 | $ 341.0

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