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Investments - Components of Net Realized Gains (Losses) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | $ 0.9 | $ 0.3 | $ 5.0 | $ 12.2
Gross realized gains on equity securities | 0.3 | 1.5 | 354.5 | 850.1
Subtotal gross realized gains on security sales | 1.2 | 1.8 | 359.5 | 862.3
Gross realized loss on available-for-sale securities | (59.5) | (58.8) | (203.1) | (347.3)
Gross realized loss on equity securities | (16.3) | (5.1) | (139.4) | (85.0)
Subtotal gross realized losses on security sales | (75.8) | (63.9) | (342.5) | (432.3)
Net realized gains (losses) on available-for-sale securities sales | (58.6) | (58.5) | (198.1) | (335.1)
Net realized gains (losses) on equity securities sales | (16.0) | (3.6) | 215.1 | 765.1
Subtotal net realized gains (losses) on security sales | (74.6) | (62.1) | 17.0 | 430.0
Gain | 8.4 | 0.0 | 21.6 | 0.0
Impairment | (2.3) | (2.2) | (6.8) | (6.5)
Subtotal net realized gains (losses) on other assets | 6.1 | (2.2) | 14.8 | (6.5)
Hybrid securities | (0.3) | (11.4) | 18.4 | (98.8)
Equity securities | (80.2) | (140.7) | (0.5) | (2,164.1)
Subtotal net holding period gains (losses) | (80.5) | (152.1) | 17.9 | (2,262.9)
Total net realized gains (losses) on securities | (149.0) | (216.4) | 49.7 | (1,839.4)
U.S. government obligations |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 0.2 | 0.0 | 4.2 | 4.6
Gross realized loss on available-for-sale securities | (14.6) | 0.0 | (27.2) | (233.5)
Net realized gains (losses) on available-for-sale securities sales | (14.4) | 0.0 | (23.0) | (228.9)
State and local government obligations |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized loss on available-for-sale securities | 0.0 | 0.0 | 0.0 | (1.0)
Net realized gains (losses) on available-for-sale securities sales | 0.0 | 0.0 | 0.0 | (1.0)
Corporate debt securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 0.7 | 0.3 | 0.8 | 6.8
Gross realized loss on available-for-sale securities | (19.1) | (14.0) | (69.3) | (51.8)
Net realized gains (losses) on available-for-sale securities sales | (18.4) | (13.7) | (68.5) | (45.0)
Residential mortgage-backed securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 0.0 | 0.0 | 0.0 | 0.7
Net realized gains (losses) on available-for-sale securities sales | 0.0 | 0.0 | 0.0 | 0.7
Commercial mortgage-backed securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized loss on available-for-sale securities | (20.6) | (44.8) | (100.6) | (58.6)
Net realized gains (losses) on available-for-sale securities sales | (20.6) | (44.8) | (100.6) | (58.6)
Other asset-backed securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 0.0 | 0.0 | 0.0 | 0.1
Gross realized loss on available-for-sale securities | (5.2) | 0.0 | (5.6) | (2.1)
Net realized gains (losses) on available-for-sale securities sales | (5.2) | 0.0 | (5.6) | (2.0)
Short-term investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized loss on available-for-sale securities | 0.0 | 0.0 | (0.4) | (0.3)
Net realized gains (losses) on available-for-sale securities sales | 0.0 | 0.0 | (0.4) | (0.3)
Nonredeemable preferred stocks |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on equity securities | 0.0 | 0.1 | 0.3 | 17.6
Gross realized loss on equity securities | (7.4) | (5.1) | (117.6) | (7.0)
Net realized gains (losses) on equity securities sales | (7.4) | (5.0) | (117.3) | 10.6
Common equities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on equity securities | 0.3 | 1.4 | 354.2 | 832.5
Gross realized loss on equity securities | (8.9) | 0.0 | (21.8) | (78.0)
Net realized gains (losses) on equity securities sales | $ (8.6) | $ 1.4 | $ 332.4 | $ 754.5

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