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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 7,015.3 | $ 7,157.5
Estimated fair value of debt securities, Unrealized loss position | 4,176.5 | $ 5,879.6
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 | 29.9 |
Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 38.2 |
Estimated fair value of debt securities, Unrealized loss position | 22.5 |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 200.5 |
Estimated fair value of debt securities, Unrealized loss position | 53.0 |
Non-Investment Grade | Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 111.5 |
Estimated fair value of debt securities, Unrealized loss position | 29.7 |
Non-Investment Grade | High Yield Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 79.7 |
Estimated fair value of debt securities, Unrealized loss position | 19.6 |
Non-Investment Grade | Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 7.6 |
Estimated fair value of debt securities, Unrealized loss position | $ 3.4 |

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