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v3.23.2

Amortized Cost and Fair Values of Securities by Security Type (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale |  |  |  |  |  |
Amortized Cost of Fixed Maturity Securities | $ 38,028.1 |  | $ 37,825.2 |  |  |
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 810.6 |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3,464.6 |  |  |  |  |
Debt Securities, Available-for-sale, Total | 35,374.1 |  | 34,840.8 |  |  |
United States Government and Government Agencies and Authorities |  |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |  |
Amortized Cost of Fixed Maturity Securities | 570.5 |  | 503.8 |  |  |
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 20.6 |  | 20.3 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 22.0 |  | 25.9 |  |  |
Debt Securities, Available-for-sale, Total | 569.1 |  | 498.2 |  |  |
States, Municipalities, and Political Subdivisions |  |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |  |
Amortized Cost of Fixed Maturity Securities | 3,961.4 |  | 4,006.0 |  |  |
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 113.9 |  | 87.1 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 537.7 |  | 635.9 |  |  |
Debt Securities, Available-for-sale, Total | 3,537.6 |  | 3,457.2 |  |  |
Foreign Governments |  |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |  |
Amortized Cost of Fixed Maturity Securities | 986.6 |  | 908.1 |  |  |
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 18.5 |  | 34.9 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 134.4 |  | 115.9 |  |  |
Debt Securities, Available-for-sale, Total | 870.7 |  | 827.1 |  |  |
Public Utilities |  |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |  |
Amortized Cost of Fixed Maturity Securities | 5,372.6 |  | 5,170.9 |  |  |
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities | 0.0 | $ 0.0 | 0.0 | $ 4.1 | $ 4.1 | $ 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 149.1 |  | 141.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 345.5 |  | 355.0 |  |  |
Debt Securities, Available-for-sale, Total | 5,176.2 |  | 4,956.9 |  |  |
Mortgage/Asset-backed Securities |  |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |  |
Amortized Cost of Fixed Maturity Securities | 576.7 |  | 592.1 |  |  |
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6.4 |  | 8.2 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 27.0 |  | 27.0 |  |  |
Debt Securities, Available-for-sale, Total | 556.1 |  | 573.3 |  |  |
All Other Corporate Bonds |  |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |  |
Amortized Cost of Fixed Maturity Securities | 26,556.3 |  | 26,640.3 |  |  |
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 502.1 |  | 452.1 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,397.5 |  | 2,567.8 |  |  |
Debt Securities, Available-for-sale, Total | 24,660.9 |  | 24,524.6 |  |  |
Redeemable Preferred Stocks |  |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |  |
Amortized Cost of Fixed Maturity Securities | 4.0 |  | 4.0 |  |  |
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.5 |  | 0.5 |  |  |
Debt Securities, Available-for-sale, Total | 3.5 |  | 3.5 |  |  |
Fixed Maturity Securities |  |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |  |
Amortized Cost of Fixed Maturity Securities | 38,028.1 |  | 37,825.2 |  |  |
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 810.6 |  | 743.6 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3,464.6 |  | 3,728.0 |  |  |
Debt Securities, Available-for-sale, Total | $ 35,374.1 |  | $ 34,840.8 |  |  |

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