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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 7,454.5 | $ 8,169.6
Estimated fair value of debt securities, Unrealized loss position | 6,990.3 | $ 7,645.8
Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 138.2 |
Estimated fair value of debt securities, Unrealized loss position | 66.3 |
Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 45.1 |
Estimated fair value of debt securities, Unrealized loss position | 39.9 |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 175.9 |
Estimated fair value of debt securities, Unrealized loss position | 107.3 |
Non-Investment Grade | Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 132.3 |
Estimated fair value of debt securities, Unrealized loss position | 64.5 |
Non-Investment Grade | High Yield Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 40.8 |
Estimated fair value of debt securities, Unrealized loss position | 40.3 |
Non-Investment Grade | Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 2.5 |
Estimated fair value of debt securities, Unrealized loss position | $ 2.2 |

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