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Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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United States Government and Government Agencies and Authorities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 101.7 | $ 118.8
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2.4 | 0.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 241.8 | 197.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 24.4 | 18.4
States, Municipalities, and Political Subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 296.3 | 128.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7.1 | 4.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,035.6 | 2,035.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 539.5 | 494.2
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 120.9 | 149.9
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2.5 | 3.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 315.6 | 312.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 135.1 | 117.9
Public Utilities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,159.9 | 373.7
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 31.1 | 10.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,824.2 | 1,720.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 341.7 | 283.3
Mortgage/Asset-backed Securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 187.8 | 60.3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4.6 | 2.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 348.9 | 316.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 32.6 | 21.5
All Other Corporate Bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,972.9 | 1,483.8
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 95.4 | 26.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,162.7 | 14,215.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,103.0 | 1,780.5
Redeemable Preferred Stocks |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0.0 | 0.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3.6 | 3.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.4 | 0.4
Fixed Maturity Securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4,839.5 | 2,314.5
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 143.1 | 47.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 18,932.4 | 18,801.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 3,176.7 | $ 2,716.2

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