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Mortgage Loans, Sorted by Applicable Credit Quality Indicators (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | $ 2,490.7 |  | $ 2,560.4 |  |  |
Loan to Value Ratio Below or Equal to 65 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,296.3 |  | 1,346.1 |  |  |
Loan To Value Ratio Above 65 To 75 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,091.4 |  | 1,076.8 |  |  |
Loan To Value Ratio Above 75 To 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 90.8 |  | 114.9 |  |  |
Loan To Value Ratio Above 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 12.2 |  | 22.6 |  |  |
Originated Five or More Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,161.1 |  | 981.5 |  |  |
Originated Four Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 379.0 |  | 304.1 |  |  |
Originated Three Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 355.3 |  | 383.0 |  |  |
Originated Two Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 171.4 |  | 359.4 |  |  |
Originated in Fiscal Year before Latest Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 359.1 |  | 180.0 |  |  |
Originated in Current Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 64.8 |  | 352.4 |  |  |
Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 1,164.9 |  | 984.1 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 380.6 |  | 305.5 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 356.7 |  | 384.4 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 171.9 |  | 360.8 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 359.9 |  | 180.7 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 65.1 |  | 353.2 |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,499.1 |  | 2,568.7 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 8.4 |  | 8.3 |  |  |
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 | 824.5 |  | 779.1 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 170.3 |  | 146.9 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 87.3 |  | 163.0 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 68.8 |  | 80.7 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 130.5 |  | 54.3 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 17.2 |  | 124.7 |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,298.6 |  | 1,348.7 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 2.3 | $ 2.4 | 2.6 | $ 3.2 | $ 3.0 | $ 3.4
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 | 242.1 |  | 115.7 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 204.3 |  | 115.4 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 269.4 |  | 215.4 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 103.1 |  | 280.1 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 229.4 |  | 126.4 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 47.9 |  | 228.5 |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,096.2 |  | 1,081.5 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 4.8 | 4.5 | 4.7 | 6.2 | 6.3 | 7.3
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 | 91.7 |  | 89.3 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0.0 |  | 26.3 |  |  |
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 | 91.7 |  | 115.6 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.9 | 0.7 | 0.7 | 1.5 | 1.2 | 1.3
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 | 6.6 |  | 0.0 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 6.0 |  | 16.9 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0.0 |  | 6.0 |  |  |
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 | 12.6 |  | 22.9 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.4 | $ 0.3 | 0.3 | $ 0.5 | $ 1.0 | $ 1.1
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 | 3.8 |  | 2.6 |  |  |
Commercial Real Estate | Originated Four Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 1.6 |  | 1.4 |  |  |
Commercial Real Estate | Originated Three Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 1.4 |  | 1.4 |  |  |
Commercial Real Estate | Originated Two Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.5 |  | 1.4 |  |  |
Commercial Real Estate | Originated in Fiscal Year before Latest Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.8 |  | 0.7 |  |  |
Commercial Real Estate | Originated in Current Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.3 |  | 0.8 |  |  |
AA Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 30.2 |  | 27.3 |  |  |
AA Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 6.2 |  | 3.3 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 24.0 |  | 0.0 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0.0 |  | 24.0 |  |  |
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 | 30.2 |  | 27.3 |  |  |
A Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 696.8 |  | 709.6 |  |  |
A Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 460.7 |  | 414.6 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 78.3 |  | 68.0 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 36.1 |  | 71.1 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 17.4 |  | 28.9 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 81.1 |  | 17.6 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 24.4 |  | 110.6 |  |  |
Financing Receivable, before Allowance for Credit Loss | 698.0 |  | 710.8 |  |  |
BBB Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,743.3 |  | 1,802.6 |  |  |
BBB Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 683.2 |  | 561.2 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 272.3 |  | 227.3 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 320.6 |  | 283.3 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 154.5 |  | 331.9 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 278.8 |  | 163.1 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 40.7 |  | 242.6 |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,750.1 |  | 1,809.4 |  |  |
BB Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 20.4 |  | 20.9 |  |  |
BB Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 14.8 |  | 5.0 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 6.0 |  | 10.2 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0.0 |  | 6.0 |  |  |
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 | $ 20.8 |  | $ 21.2 |  |  |

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