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Mortgage Loans, Sorted by Applicable Credit Quality Indicators (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | $ 2,261.1 |  | $ 2,318.2 |  |  |
Loan to Value Ratio Below or Equal to 65 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,485.8 |  | 1,409.9 |  |  |
Loan To Value Ratio Above 65 To 75 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 588.7 |  | 707.0 |  |  |
Loan To Value Ratio Above 75 To 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 116.5 |  | 136.5 |  |  |
Loan To Value Ratio Above 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 70.1 |  | 64.8 |  |  |
Originated Five or More Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,599.3 |  | 1,317.6 |  |  |
Originated Four Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 162.8 |  | 334.8 |  |  |
Originated Three Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 333.6 |  | 164.9 |  |  |
Originated Two Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 88.2 |  | 347.1 |  |  |
Originated in Fiscal Year before Latest Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 66.6 |  | 87.0 |  |  |
Originated in Current Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 10.6 |  | 66.8 |  |  |
Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 1,609.1 |  | 1,323.9 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 163.3 |  | 336.1 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 334.6 |  | 165.5 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 88.6 |  | 348.1 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 67.0 |  | 87.6 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 10.6 |  | 67.2 |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,273.2 |  | 2,328.4 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 12.1 |  | 10.2 |  |  |
Commercial Real Estate | Loan to Value Ratio Below or Equal to 65 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 1,147.8 |  | 908.3 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 121.0 |  | 197.7 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 166.3 |  | 116.4 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 15.8 |  | 145.2 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 38.6 |  | 16.2 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 30.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,489.5 |  | 1,413.8 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 3.7 | $ 3.6 | 3.8 | $ 3.3 | $ 3.0 | $ 3.0
Commercial Real Estate | Loan To Value Ratio Above 65 To 75 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 309.3 |  | 252.1 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 34.1 |  | 138.4 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 136.8 |  | 40.8 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 72.8 |  | 171.0 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 28.4 |  | 71.4 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 10.6 |  | 37.2 |  |  |
Financing Receivable, before Allowance for Credit Loss | 592.0 |  | 710.9 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 3.3 | 3.4 | 3.8 | 4.8 | 5.3 | 4.7
Commercial Real Estate | Loan To Value Ratio Above 75 To 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 78.5 |  | 97.3 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 8.2 |  | 0.0 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 31.5 |  | 8.3 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0.0 |  | 31.9 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | 118.2 |  | 137.5 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 1.7 | 1.2 | 1.2 | 0.9 | 1.2 | 1.1
Commercial Real Estate | Loan To Value Ratio Above 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 73.5 |  | 66.2 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | 73.5 |  | 66.2 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 3.4 | $ 2.5 | 1.4 | $ 2.1 | $ 0.5 | $ 0.5
Commercial Real Estate | Originated Five or More Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 9.8 |  | 6.3 |  |  |
Commercial Real Estate | Originated Four Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.5 |  | 1.3 |  |  |
Commercial Real Estate | Originated Three Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 1.0 |  | 0.6 |  |  |
Commercial Real Estate | Originated Two Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.4 |  | 1.0 |  |  |
Commercial Real Estate | Originated in Fiscal Year before Latest Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.4 |  | 0.6 |  |  |
Commercial Real Estate | Originated in Current Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.0 |  | 0.4 |  |  |
AA Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 83.6 |  | 85.2 |  |  |
AA Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 83.7 |  | 74.3 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0.0 |  | 11.0 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | 83.7 |  | 85.3 |  |  |
A Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 988.6 |  | 942.5 |  |  |
A Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 694.4 |  | 589.0 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 99.6 |  | 100.3 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 134.3 |  | 94.1 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 24.5 |  | 100.1 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 38.0 |  | 23.2 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 38.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | 990.8 |  | 944.7 |  |  |
BBB Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,133.8 |  | 1,249.5 |  |  |
BBB Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 772.6 |  | 618.4 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 63.7 |  | 224.8 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 200.3 |  | 71.4 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 64.1 |  | 248.0 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 29.0 |  | 64.4 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 10.6 |  | 29.2 |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,140.3 |  | 1,256.2 |  |  |
BB Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 55.1 |  | 41.0 |  |  |
BB Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 58.4 |  | 42.2 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 58.4 |  | $ 42.2 |  |  |

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