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Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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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 | $ 204.0 | $ 9.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1.9 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.1 | 0.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9.2 |
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 | 2,305.9 | 326.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 6.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1.1 | 0.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.3 | 0.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 499.8 |
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 234.6 | 234.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 18.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 32.8 | 10.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 14.2 | 1.8
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 83.1 |
Public Utilities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,724.3 | 263.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 9.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 51.3 | 17.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 17.7 | 0.7
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 191.2 |
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 | 322.8 | 29.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0.1 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7.8 |
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 | 15,401.0 | 2,146.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 51.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 377.9 | 199.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 99.5 | 11.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,678.4 |
Redeemable Preferred Stocks |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3.7 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0.0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.3 |
Fixed Maturity Securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 20,196.3 | 3,008.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 86.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 465.1 | 228.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 131.8 | $ 13.5
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,469.8 |

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