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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 7,054.4 | $ 7,157.5
Estimated fair value of debt securities, Unrealized loss position | 6,262.0 | $ 5,879.6
Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 122.3 |
Estimated fair value of debt securities, Unrealized loss position | 25.1 |
Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 39.4 |
Estimated fair value of debt securities, Unrealized loss position | 32.7 |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 187.1 |
Estimated fair value of debt securities, Unrealized loss position | 76.0 |
Non-Investment Grade | Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 109.0 |
Estimated fair value of debt securities, Unrealized loss position | 23.3 |
Non-Investment Grade | High Yield Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 71.2 |
Estimated fair value of debt securities, Unrealized loss position | 47.5 |
Non-Investment Grade | Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 5.2 |
Estimated fair value of debt securities, Unrealized loss position | $ 4.9 |

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