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Debt Securities (Composition of Debt Securities Portfolio in Unrealized Loss Position by Credit Rating Agencies) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 5,879.6 | $ 7,645.8
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 63.6 |
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 1,064.2 |
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 134.7 |
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 119.3 |
Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 3,563.6 |
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 647.6 |
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 286.6 |
Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 5,458.3 |
Percentage of debt securities in unrealized loss position | 92.80% |
Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 352.5 |
Percentage of debt securities in unrealized loss position | 6.00% |
Investment Grade | U.S. Treasury bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 63.6 |
Percentage of debt securities in unrealized loss position | 100.00% |
Investment Grade | U.S. Treasury bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Investment Grade | Municipal bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 1,046.8 |
Percentage of debt securities in unrealized loss position | 98.40% |
Investment Grade | Municipal bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 17.1 |
Percentage of debt securities in unrealized loss position | 1.60% |
Investment Grade | Foreign government bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 132.6 |
Percentage of debt securities in unrealized loss position | 98.40% |
Investment Grade | Foreign government bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 1.3 |
Percentage of debt securities in unrealized loss position | 1.00% |
Investment Grade | Governmental agency bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 119.3 |
Percentage of debt securities in unrealized loss position | 100.00% |
Investment Grade | Governmental agency bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Investment Grade | Governmental agency mortgage-backed securities | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 3,563.6 |
Percentage of debt securities in unrealized loss position | 100.00% |
Investment Grade | Governmental agency mortgage-backed securities | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Investment Grade | U.S. corporate debt securities | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 364.4 |
Percentage of debt securities in unrealized loss position | 56.30% |
Investment Grade | U.S. corporate debt securities | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 229.4 |
Percentage of debt securities in unrealized loss position | 35.40% |
Investment Grade | Foreign corporate debt securities | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 168.0 |
Percentage of debt securities in unrealized loss position | 58.70% |
Investment Grade | Foreign corporate debt securities | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 104.7 |
Percentage of debt securities in unrealized loss position | 36.50% |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 68.8 |
Percentage of debt securities in unrealized loss position | 1.20% |
Non-Investment Grade | U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.3 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.8 |
Percentage of debt securities in unrealized loss position | 0.60% |
Non-Investment Grade | Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 53.8 |
Percentage of debt securities in unrealized loss position | 8.30% |
Non-Investment Grade | Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 13.9 |
Percentage of debt securities in unrealized loss position | 4.80% |

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