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Mortgage Loans, Sorted by Applicable Credit Quality Indicators (Detail) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount $ 2,298.8 $ 2,318.2    
Loan to Value Ratio Below or Equal to 65 Percent        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 1,443.9 1,409.9    
Loan To Value Ratio Above 65 To 75 Percent        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 656.1 707.0    
Loan To Value Ratio Above 75 To 85 Percent        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 135.5 136.5    
Loan To Value Ratio Above 85 Percent        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 63.3 64.8    
Originated Five or More Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 1,636.7 1,317.6    
Originated Four Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 163.7 334.8    
Originated Three Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 344.9 164.9    
Originated Two Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 86.8 347.1    
Originated in Fiscal Year before Latest Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 66.7 87.0    
Originated in Current Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 0.0 66.8    
AA Credit Rating        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 84.4 85.2    
A Credit Rating        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 1,010.8 942.5    
BBB Credit Rating        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 1,163.9 1,249.5    
BB Credit Rating        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 39.7 41.0    
Commercial Real Estate        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 1,644.9 1,323.9    
Financing Receivable, Originated Four Years before Latest Fiscal Year 164.3 336.1    
Financing Receivable, Originated Three Years before Latest Fiscal Year 345.9 165.5    
Financing Receivable, Originated Two Years before Latest Fiscal Year 87.3 348.1    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 67.1 87.6    
Financing Receivable, Originated in Current Fiscal Year 0.0 67.2    
Financing Receivable, before Allowance for Credit Loss 2,309.5 2,328.4    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans (10.7) (10.2) $ (10.0) $ (9.3)
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 1,127.0 908.3    
Financing Receivable, Originated Four Years before Latest Fiscal Year 121.8 197.7    
Financing Receivable, Originated Three Years before Latest Fiscal Year 144.1 116.4    
Financing Receivable, Originated Two Years before Latest Fiscal Year 16.0 145.2    
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 1,447.6 1,413.8    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans (3.6) (3.8) (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 355.4 252.1    
Financing Receivable, Originated Four Years before Latest Fiscal Year 34.3 138.4    
Financing Receivable, Originated Three Years before Latest Fiscal Year 170.1 40.8    
Financing Receivable, Originated Two Years before Latest Fiscal Year 71.3 171.0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 28.4 71.4    
Financing Receivable, Originated in Current Fiscal Year 0.0 37.2    
Financing Receivable, before Allowance for Credit Loss 659.5 710.9    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans (3.4) (3.8) (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 96.7 97.3    
Financing Receivable, Originated Four Years before Latest Fiscal Year 8.2 0.0    
Financing Receivable, Originated Three Years before Latest Fiscal Year 31.7 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 136.6 137.5    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans (1.2) (1.2) (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 65.8 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 65.8 66.2    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans (2.5) (1.4) $ (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 (8.2) (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 (0.6) (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 (0.5) (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)    
Commercial Real Estate | AA Credit Rating        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 84.5 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 84.5 85.3    
Commercial Real Estate | A Credit Rating        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 730.4 589.0    
Financing Receivable, Originated Four Years before Latest Fiscal Year 100.2 100.3    
Financing Receivable, Originated Three Years before Latest Fiscal Year 121.4 94.1    
Financing Receivable, Originated Two Years before Latest Fiscal Year 23.0 100.1    
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 1,013.0 944.7    
Commercial Real Estate | BBB Credit Rating        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 788.0 618.4    
Financing Receivable, Originated Four Years before Latest Fiscal Year 64.1 224.8    
Financing Receivable, Originated Three Years before Latest Fiscal Year 224.5 71.4    
Financing Receivable, Originated Two Years before Latest Fiscal Year 64.3 248.0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 29.1 64.4    
Financing Receivable, Originated in Current Fiscal Year 0.0 29.2    
Financing Receivable, before Allowance for Credit Loss 1,170.0 1,256.2    
Commercial Real Estate | BB Credit Rating        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 42.0 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 $ 42.0 $ 42.2