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v3.23.2

Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
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 | $ 118.9 | $ 246.6
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.8 | 22.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 192.3 | 12.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 21.2 | 3.3
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 | 452.4 | 1,920.1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 19.1 | 476.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,820.3 | 346.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 518.6 | 159.8
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 244.6 | 160.1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22.4 | 47.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 241.5 | 176.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 112.0 | 68.0
Public Utilities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,292.0 | 2,242.2
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 54.5 | 252.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,428.6 | 255.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 291.0 | 103.0
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 | 320.1 | 386.6
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 18.7 | 27.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 70.4 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 8.3 | 0.0
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 | 6,122.1 | 15,865.6
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 323.9 | 1,799.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,438.5 | 2,194.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,073.6 | 768.1
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 | 3.5
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3.5 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.5 | 0.0
Fixed Maturity Securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8,550.1 | 20,824.7
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 439.4 | 2,625.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 15,195.1 | 2,985.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 3,025.2 | $ 1,102.2

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