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v3.23.1

Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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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 | $ 132.2 | $ 246.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6.6 | 22.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 101.1 | 12.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10.8 | 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 | 574.0 | 1,920.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 31.7 | 476.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,657.5 | 346.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 471.3 | 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 | 130.2 | 160.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 34.9 | 47.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 207.4 | 176.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 70.6 | 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 | 1,341.2 | 2,242.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 92.5 | 252.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 808.0 | 255.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 192.5 | 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 | 320.0 | 386.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13.4 | 27.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 73.3 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6.9 | 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 | 10,031.0 | 15,865.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 573.6 | 1,799.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7,168.4 | 2,194.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,521.4 | 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 | 3.6 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.4 | 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 | 12,528.6 | 20,824.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 752.7 | 2,625.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 10,019.3 | 2,985.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 2,273.9 | $ 1,102.2

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