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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 7,015.3 | $ 7,157.5
Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 6,269.1 |
Percentage of debt securities by credit rating agencies | 89.30% |
Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 545.7 |
Percentage of debt securities by credit rating agencies | 7.80% |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 200.5 |
Percentage of debt securities by credit rating agencies | 2.90% |
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 190.4 | 199.3
U.S. Treasury bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 190.4 |
Percentage of debt securities by credit rating agencies | 100.00% |
U.S. Treasury bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 0.0 |
Percentage of debt securities by credit rating agencies | 0.00% |
U.S. Treasury bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 0.0 |
Percentage of debt securities by credit rating agencies | 0.00% |
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 731.4 | 1,245.8
Municipal bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 708.9 |
Percentage of debt securities by credit rating agencies | 97.00% |
Municipal bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 20.8 |
Percentage of debt securities by credit rating agencies | 2.80% |
Municipal bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 1.7 |
Percentage of debt securities by credit rating agencies | 0.20% |
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 226.6 | 219.3
Foreign government bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 221.0 |
Percentage of debt securities by credit rating agencies | 97.50% |
Foreign government bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 4.8 |
Percentage of debt securities by credit rating agencies | 2.10% |
Foreign government bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 0.8 |
Percentage of debt securities by credit rating agencies | 0.40% |
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 222.0 | 195.4
Governmental agency bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 222.0 |
Percentage of debt securities by credit rating agencies | 100.00% |
Governmental agency bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 0.0 |
Percentage of debt securities by credit rating agencies | 0.00% |
Governmental agency bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 0.0 |
Percentage of debt securities by credit rating agencies | 0.00% |
Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 4,285.9 | 3,875.7
Governmental agency mortgage-backed securities | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 4,285.9 |
Percentage of debt securities by credit rating agencies | 100.00% |
Governmental agency mortgage-backed securities | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 0.0 |
Percentage of debt securities by credit rating agencies | 0.00% |
Governmental agency mortgage-backed securities | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 0.0 |
Percentage of debt securities by credit rating agencies | 0.00% |
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 864.5 | 958.4
U.S. corporate debt securities | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 384.4 |
Percentage of debt securities by credit rating agencies | 44.40% |
U.S. corporate debt securities | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 325.7 |
Percentage of debt securities by credit rating agencies | 37.70% |
U.S. corporate debt securities | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 154.4 |
Percentage of debt securities by credit rating agencies | 17.90% |
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 494.5 | $ 463.6
Foreign corporate debt securities | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 256.5 |
Percentage of debt securities by credit rating agencies | 51.90% |
Foreign corporate debt securities | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 194.4 |
Percentage of debt securities by credit rating agencies | 39.30% |
Foreign corporate debt securities | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 43.6 |
Percentage of debt securities by credit rating agencies | 8.80% |

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