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Mortgage Loans Sorted by Applicable Credit Quality Indicators (Detail) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | $ (15.9) | $ (16.1) |
Mortgage Loans | [1] | 2,109.5 | 2,224.5 |
Loan to Value Ratio Below or Equal to 65 Percent |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans | [1] | 1,701.2 | 1,639.6 |
Loan To Value Ratio Above 65 To 75 Percent |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans | [1] | 164.3 | 367.6 |
Loan To Value Ratio Above 75 To 85 Percent |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans | [1] | 162.6 | 152.3 |
Loan To Value Ratio Above 85 Percent |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans | [1] | 81.4 | 65.0 |
Originated Five or More Years before Last Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 1,458.9 | 1,541.0 |
Originated Four Years before Last Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 320.7 | 154.2 |
Originated Three Years before Last Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 85.1 | 329.6 |
Originated Two Years before Last Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 65.8 | 87.3 |
Originated in Fiscal Year before Latest Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 45.6 | 66.4 |
Originated in Current Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 133.4 | 46.0 |
AA Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 125.6 | 117.8 |
A Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 1,053.4 | 1,099.1 |
BBB Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 804.0 | 915.5 |
BB Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 120.5 | 85.0 |
B Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Mortgage Loans |  | 6.0 | 7.1 |
Commercial Real Estate |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year |  | 1,472.4 | 1,554.7 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year |  | 321.6 | 154.7 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year |  | 85.4 | 330.6 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year |  | 66.2 | 87.6 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year |  | 45.8 | 66.8 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | 134.0 | 46.2 |
Financing Receivable, before Allowance for Credit Loss |  | 2,125.4 | 2,240.6 |
Financing Receivable, Allowance for Credit Loss |  | (15.9) | (16.1) | $ (10.2)
Commercial Real Estate | Loan to Value Ratio Below or Equal to 65 Percent |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | [1] | 1,264.1 | 1,229.6 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | [1] | 238.9 | 112.9 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | [1] | 63.0 | 210.0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | [1] | 38.5 | 40.8 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | [1] | 11.6 | 38.7 |
Financing Receivable, Year One, Originated, Current Fiscal Year | [1] | 89.4 | 11.7 |
Financing Receivable, before Allowance for Credit Loss | [1] | 1,705.5 | 1,643.7 |
Financing Receivable, Allowance for Credit Loss | [1] | (4.3) | (4.2) | (3.8)
Commercial Real Estate | Loan To Value Ratio Above 65 To 75 Percent |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | [1] | 59.8 | 154.1 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | [1] | 10.7 | 33.7 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | [1] | 8.4 | 72.1 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | [1] | 27.7 | 46.8 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | [1] | 34.2 | 28.1 |
Financing Receivable, Year One, Originated, Current Fiscal Year | [1] | 24.2 | 34.5 |
Financing Receivable, before Allowance for Credit Loss | [1] | 165.0 | 369.3 |
Financing Receivable, Allowance for Credit Loss | [1] | (0.7) | (1.7) | (3.8)
Commercial Real Estate | Loan To Value Ratio Above 75 To 85 Percent |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | [1] | 115.5 | 126.4 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | [1] | 35.0 | 8.1 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | [1] | 14.0 | 20.1 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | [1] | 0.0 | 0.0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | [1] | 0.0 | 0.0 |
Financing Receivable, Year One, Originated, Current Fiscal Year | [1] | 0.0 | 0.0 |
Financing Receivable, before Allowance for Credit Loss | [1] | 164.5 | 154.6 |
Financing Receivable, Allowance for Credit Loss | [1] | (1.9) | (2.2) | (1.2)
Commercial Real Estate | Loan To Value Ratio Above 85 Percent |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | [1] | 33.0 | 44.6 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | [1] | 37.0 | 0.0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | [1] | 0.0 | 28.4 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | [1] | 0.0 | 0.0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | [1] | 0.0 | 0.0 |
Financing Receivable, Year One, Originated, Current Fiscal Year | [1] | 20.4 | 0.0 |
Financing Receivable, before Allowance for Credit Loss | [1] | 90.4 | 73.0 |
Financing Receivable, Allowance for Credit Loss | [1] | (9.0) | (8.0) | $ (1.4)
Commercial Real Estate | Originated Five or More Years before Last Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (13.5) | (13.7) |
Commercial Real Estate | Originated Four Years before Last Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (0.9) | (0.5) |
Commercial Real Estate | Originated Three Years before Last Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (0.3) | (1.0) |
Commercial Real Estate | Originated Two Years before Last Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (0.4) | (0.3) |
Commercial Real Estate | Originated in Fiscal Year before Latest Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (0.2) | (0.4) |
Commercial Real Estate | Originated in Current Fiscal Year |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | (0.6) | (0.2) |
Commercial Real Estate | AA Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year |  | 100.1 | 111.5 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year |  | 25.6 | 0.0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year |  | 0.0 | 6.4 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, before Allowance for Credit Loss |  | 125.7 | 117.9 |
Commercial Real Estate | A Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year |  | 794.0 | 780.5 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year |  | 144.9 | 99.6 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year |  | 23.6 | 169.1 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year |  | 9.5 | 24.6 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year |  | 6.4 | 9.5 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | 77.2 | 18.0 |
Financing Receivable, before Allowance for Credit Loss |  | 1,055.6 | 1,101.3 |
Commercial Real Estate | BBB Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year |  | 482.4 | 561.7 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year |  | 131.2 | 55.1 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year |  | 61.8 | 155.1 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year |  | 56.7 | 63.0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year |  | 39.4 | 57.3 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | 36.4 | 28.2 |
Financing Receivable, before Allowance for Credit Loss |  | 807.9 | 920.4 |
Commercial Real Estate | BB Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year |  | 81.7 | 86.8 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year |  | 19.9 | 0.0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | 20.4 | 0.0 |
Financing Receivable, before Allowance for Credit Loss |  | 122.0 | 86.8 |
Commercial Real Estate | B Credit Rating |  |  |  |
Financing Receivable, Credit Quality Indicator |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year |  | 14.2 | 14.2 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | 0.0 | 0.0 |
Financing Receivable, before Allowance for Credit Loss |  | $ 14.2 | $ 14.2 |
[1] | Loan-to-Value Ratio utilizes the most recent internal valuation of the property

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