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Debt Securities (Investments in Debt Securities by Contractual Maturity) (Detail) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Amortized cost | $ 8,478.2 | $ 9,169.6
Debt securities, Estimated fair value | 7,624.7 | 8,169.6
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 144.4 |
Amortized cost, Due after one through five years | 70.8 |
Amortized cost, Due after five through ten years | 4.5 |
Amortized cost, Due after ten years | 6.4 |
Debt Securities, Amortized cost | 226.1 | 308.5
Estimated fair value, Due in one year or less | 144.3 |
Estimated fair value, Due after one through five years | 66.6 |
Estimated fair value, Due after five through ten years | 4.0 |
Estimated fair value, Due after ten years | 6.3 |
Debt securities, Estimated fair value | 221.2 | 302.8
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 10.7 |
Amortized cost, Due after one through five years | 257.0 |
Amortized cost, Due after five through ten years | 564.4 |
Amortized cost, Due after ten years | 565.0 |
Debt Securities, Amortized cost | 1,397.1 | 1,670.6
Estimated fair value, Due in one year or less | 10.7 |
Estimated fair value, Due after one through five years | 237.2 |
Estimated fair value, Due after five through ten years | 494.2 |
Estimated fair value, Due after ten years | 507.0 |
Debt securities, Estimated fair value | 1,249.1 | 1,478.7
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 30.8 |
Amortized cost, Due after one through five years | 97.8 |
Amortized cost, Due after five through ten years | 68.7 |
Amortized cost, Due after ten years | 9.3 |
Debt Securities, Amortized cost | 206.6 | 208.0
Estimated fair value, Due in one year or less | 30.6 |
Estimated fair value, Due after one through five years | 96.7 |
Estimated fair value, Due after five through ten years | 60.6 |
Estimated fair value, Due after ten years | 8.2 |
Debt securities, Estimated fair value | 196.1 | 193.7
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 25.8 |
Amortized cost, Due after one through five years | 157.6 |
Amortized cost, Due after five through ten years | 6.7 |
Amortized cost, Due after ten years | 56.7 |
Debt Securities, Amortized cost | 246.8 | 247.9
Estimated fair value, Due in one year or less | 25.4 |
Estimated fair value, Due after one through five years | 152.1 |
Estimated fair value, Due after five through ten years | 6.0 |
Estimated fair value, Due after ten years | 47.0 |
Debt securities, Estimated fair value | 230.5 | 228.6
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 9.3 |
Amortized cost, Due after one through five years | 646.1 |
Amortized cost, Due after five through ten years | 191.0 |
Amortized cost, Due after ten years | 59.9 |
Debt Securities, Amortized cost | 906.3 | 1,004.4
Estimated fair value, Due in one year or less | 9.2 |
Estimated fair value, Due after one through five years | 596.6 |
Estimated fair value, Due after five through ten years | 182.1 |
Estimated fair value, Due after ten years | 50.4 |
Debt securities, Estimated fair value | 838.3 | 921.4
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 18.5 |
Amortized cost, Due after one through five years | 313.6 |
Amortized cost, Due after five through ten years | 101.3 |
Amortized cost, Due after ten years | 38.9 |
Debt Securities, Amortized cost | 472.3 | 476.8
Estimated fair value, Due in one year or less | 18.2 |
Estimated fair value, Due after one through five years | 295.4 |
Estimated fair value, Due after five through ten years | 96.5 |
Estimated fair value, Due after ten years | 34.5 |
Debt securities, Estimated fair value | 444.6 | $ 442.0
Aggregate Debt Securities Excluding Mortgage Backed And Asset Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 239.5 |
Amortized cost, Due after one through five years | 1,542.9 |
Amortized cost, Due after five through ten years | 936.6 |
Amortized cost, Due after ten years | 736.2 |
Debt Securities, Amortized cost | 3,455.2 |
Estimated fair value, Due in one year or less | 238.4 |
Estimated fair value, Due after one through five years | 1,444.6 |
Estimated fair value, Due after five through ten years | 843.4 |
Estimated fair value, Due after ten years | 653.4 |
Debt securities, Estimated fair value | 3,179.8 |
Collateralized Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 5,023.0 |
Estimated fair value | $ 4,444.9 |

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