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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Detail) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 8,018.9 | $ 7,265.9
Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 7,271.0 |
Percentage of debt securities by credit rating agencies | 90.60% |
Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 533.4 |
Percentage of debt securities by credit rating agencies | 6.70% |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 214.5 |
Percentage of debt securities by credit rating agencies | 2.70% |
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 170.2 | 175.6
U.S. Treasury bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 170.2 |
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 | $ 876.7 | 776.5
Municipal bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 856.7 |
Percentage of debt securities by credit rating agencies | 97.80% |
Municipal bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 19.7 |
Percentage of debt securities by credit rating agencies | 2.20% |
Municipal bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 0.3 |
Percentage of debt securities by credit rating agencies | 0.00% |
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 225.5 | 211.6
Foreign government bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 220.3 |
Percentage of debt securities by credit rating agencies | 97.70% |
Foreign government bonds | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 4.5 |
Percentage of debt securities by credit rating agencies | 2.00% |
Foreign government bonds | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 0.7 |
Percentage of debt securities by credit rating agencies | 0.30% |
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 206.3 | 189.8
Governmental agency bonds | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 206.3 |
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 | $ 5,037.9 | 4,502.3
Governmental agency mortgage-backed securities | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 5,037.9 |
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 | $ 1,010.0 | 925.6
U.S. corporate debt securities | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 526.1 |
Percentage of debt securities by credit rating agencies | 52.00% |
U.S. corporate debt securities | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 312.6 |
Percentage of debt securities by credit rating agencies | 31.00% |
U.S. corporate debt securities | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 171.3 |
Percentage of debt securities by credit rating agencies | 17.00% |
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 492.3 | $ 484.5
Foreign corporate debt securities | Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 253.5 |
Percentage of debt securities by credit rating agencies | 51.50% |
Foreign corporate debt securities | Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 196.6 |
Percentage of debt securities by credit rating agencies | 39.90% |
Foreign corporate debt securities | Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 42.2 |
Percentage of debt securities by credit rating agencies | 8.60% |

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