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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
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