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Debt Securities (Composition of Debt Securities Portfolio in Unrealized Loss Position by Credit Rating Agencies) (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 6,990.3 | $ 7,645.8
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 113.6 |
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 1,137.4 |
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 176.6 |
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 224.4 |
Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 4,188.8 |
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 778.4 |
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 371.1 |
Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 6,401.5 |
Percentage of debt securities in unrealized loss position | 91.60% |
Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 481.5 |
Percentage of debt securities in unrealized loss position | 6.90% |
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 | $ 113.6 |
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 | $ 1,099.2 |
Percentage of debt securities in unrealized loss position | 96.70% |
Investment Grade | Municipal bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 37.9 |
Percentage of debt securities in unrealized loss position | 3.30% |
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 | $ 174.6 |
Percentage of debt securities in unrealized loss position | 98.90% |
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 | 0.70% |
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 | $ 224.4 |
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 | $ 4,188.8 |
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 | $ 410.7 |
Percentage of debt securities in unrealized loss position | 52.80% |
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 | $ 286.0 |
Percentage of debt securities in unrealized loss position | 36.70% |
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 | $ 190.2 |
Percentage of debt securities in unrealized loss position | 51.30% |
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 | $ 156.3 |
Percentage of debt securities in unrealized loss position | 42.10% |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 107.3 |
Percentage of debt securities in unrealized loss position | 1.50% |
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 | $ 0.7 |
Percentage of debt securities in unrealized loss position | 0.40% |
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 | $ 81.7 |
Percentage of debt securities in unrealized loss position | 10.50% |
Non-Investment Grade | Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 24.6 |
Percentage of debt securities in unrealized loss position | 6.60% |

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