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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 7,080.7 | $ 7,157.5
Estimated fair value of debt securities, Unrealized loss position | 6,314.9 | $ 5,879.6
Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 120.6 |
Estimated fair value of debt securities, Unrealized loss position | 20.7 |
Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 40.9 |
Estimated fair value of debt securities, Unrealized loss position | 32.5 |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 202.5 |
Estimated fair value of debt securities, Unrealized loss position | 70.3 |
Non-Investment Grade | Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 110.8 |
Estimated fair value of debt securities, Unrealized loss position | 19.6 |
Non-Investment Grade | High Yield Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 84.5 |
Estimated fair value of debt securities, Unrealized loss position | 46.1 |
Non-Investment Grade | Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 5.5 |
Estimated fair value of debt securities, Unrealized loss position | $ 4.3 |

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