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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 7,624.7 | $ 8,169.6
Estimated fair value of debt securities, Unrealized loss position | 6,875.7 | $ 7,645.8
Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 129.9 |
Estimated fair value of debt securities, Unrealized loss position | 89.0 |
Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 45.5 |
Estimated fair value of debt securities, Unrealized loss position | 38.9 |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 172.6 |
Estimated fair value of debt securities, Unrealized loss position | 133.2 |
Non-Investment Grade | Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 124.9 |
Estimated fair value of debt securities, Unrealized loss position | 86.9 |
Non-Investment Grade | High Yield Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 44.8 |
Estimated fair value of debt securities, Unrealized loss position | 43.8 |
Non-Investment Grade | Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 2.6 |
Estimated fair value of debt securities, Unrealized loss position | $ 2.2 |

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