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Mortgage Loans, Sorted by Applicable Credit Quality Indicators (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount $ 2,238.9   $ 2,318.2      
Loan to Value Ratio Below or Equal to 65 Percent            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 1,527.0   1,409.9      
Loan To Value Ratio Above 65 To 75 Percent            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 481.6   707.0      
Loan To Value Ratio Above 75 To 85 Percent            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 148.5   136.5      
Loan To Value Ratio Above 85 Percent            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 81.8   64.8      
Originated Five or More Years before Last Fiscal Year            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 1,574.9   1,317.6      
Originated Four Years before Last Fiscal Year            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 155.2   334.8      
Originated Three Years before Last Fiscal Year            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 331.4   164.9      
Originated Two Years before Last Fiscal Year            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 87.8   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 23.0   66.8      
Commercial Real Estate            
Mortgage Loans on Real Estate            
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 1,589.0   1,323.9      
Financing Receivable, Originated Four Years before Latest Fiscal Year 155.7   336.1      
Financing Receivable, Originated Three Years before Latest Fiscal Year 332.5   165.5      
Financing Receivable, Originated Two Years before Latest Fiscal Year 88.1   348.1      
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 67.0   87.6      
Financing Receivable, Originated in Current Fiscal Year 23.1   67.2      
Financing Receivable, before Allowance for Credit Loss 2,255.4   2,328.4      
Financing Receivable, Allowance for Credit Losses, Mortgage Loans 16.5   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 1,174.1   908.3      
Financing Receivable, Originated Four Years before Latest Fiscal Year 113.7   197.7      
Financing Receivable, Originated Three Years before Latest Fiscal Year 188.8   116.4      
Financing Receivable, Originated Two Years before Latest Fiscal Year 15.6   145.2      
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 38.7   16.2      
Financing Receivable, Originated in Current Fiscal Year 0.0   30.0      
Financing Receivable, before Allowance for Credit Loss 1,530.9   1,413.8      
Financing Receivable, Allowance for Credit Losses, Mortgage Loans 4.0 $ 3.7 3.8 $ 3.2 $ 3.3 $ 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 231.2   252.1      
Financing Receivable, Originated Four Years before Latest Fiscal Year 33.9   138.4      
Financing Receivable, Originated Three Years before Latest Fiscal Year 94.9   40.8      
Financing Receivable, Originated Two Years before Latest Fiscal Year 72.5   171.0      
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 28.3   71.4      
Financing Receivable, Originated in Current Fiscal Year 23.1   37.2      
Financing Receivable, before Allowance for Credit Loss 483.9   710.9      
Financing Receivable, Allowance for Credit Losses, Mortgage Loans 2.2 3.3 3.8 4.4 4.8 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 122.6   97.3      
Financing Receivable, Originated Four Years before Latest Fiscal Year 8.1   0.0      
Financing Receivable, Originated Three Years before Latest Fiscal Year 20.3   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 151.0   137.5      
Financing Receivable, Allowance for Credit Losses, Mortgage Loans 2.5 1.7 1.2 0.9 0.9 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 61.1   66.2      
Financing Receivable, Originated Four Years before Latest Fiscal Year 0.0   0.0      
Financing Receivable, Originated Three Years before Latest Fiscal Year 28.5   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 89.6   66.2      
Financing Receivable, Allowance for Credit Losses, Mortgage Loans 7.8 $ 3.4 1.4 $ 1.7 $ 2.1 $ 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 14.1   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 1.1   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 0.3   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 0.1   0.4      
AA Credit Rating            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 94.5   85.2      
AA Credit Rating | Commercial Real Estate            
Mortgage Loans on Real Estate            
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 88.1   74.3      
Financing Receivable, Originated Four Years before Latest Fiscal Year 0.0   11.0      
Financing Receivable, Originated Three Years before Latest Fiscal Year 6.4   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 94.5   85.3      
A Credit Rating            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 982.2   942.5      
A Credit Rating | Commercial Real Estate            
Mortgage Loans on Real Estate            
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 684.4   589.0      
Financing Receivable, Originated Four Years before Latest Fiscal Year 92.6   100.3      
Financing Receivable, Originated Three Years before Latest Fiscal Year 145.0   94.1      
Financing Receivable, Originated Two Years before Latest Fiscal Year 24.3   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 984.3   944.7      
BBB Credit Rating            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 1,064.4   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 710.4   618.4      
Financing Receivable, Originated Four Years before Latest Fiscal Year 63.1   224.8      
Financing Receivable, Originated Three Years before Latest Fiscal Year 181.1   71.4      
Financing Receivable, Originated Two Years before Latest Fiscal Year 63.8   248.0      
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 29.0   64.4      
Financing Receivable, Originated in Current Fiscal Year 23.1   29.2      
Financing Receivable, before Allowance for Credit Loss 1,070.5   1,256.2      
BB Credit Rating            
Mortgage Loans on Real Estate            
Mortgage Loans, Carrying Amount 97.8   41.0      
BB Credit Rating | Commercial Real Estate            
Mortgage Loans on Real Estate            
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 106.1   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 $ 106.1   $ 42.2