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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 7,157.5 | $ 8,169.6
Estimated fair value of debt securities, Unrealized loss position | 5,879.6 | $ 7,645.8
Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 130.5 |
Estimated fair value of debt securities, Unrealized loss position | 24.6 |
Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 38.8 |
Estimated fair value of debt securities, Unrealized loss position | 34.0 |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 179.2 |
Estimated fair value of debt securities, Unrealized loss position | 68.8 |
Non-Investment Grade | Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 120.3 |
Estimated fair value of debt securities, Unrealized loss position | 24.2 |
Non-Investment Grade | High Yield Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 53.6 |
Estimated fair value of debt securities, Unrealized loss position | 41.1 |
Non-Investment Grade | Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 3.6 |
Estimated fair value of debt securities, Unrealized loss position | $ 3.2 |

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