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Investments - Residential Mortgage Loans By Geographic Distribution (Details) - Residential mortgage loans - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 5,302.3 $ 4,697.9
Percent of mortgage loans (as a percent) 100.00% 100.00%
New England    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 216.9 $ 158.0
Percent of mortgage loans (as a percent) 4.10% 3.40%
Middle Atlantic    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 483.2 $ 365.8
Percent of mortgage loans (as a percent) 9.10% 7.80%
East North Central    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 284.7 $ 212.6
Percent of mortgage loans (as a percent) 5.40% 4.50%
West North Central    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 127.4 $ 95.3
Percent of mortgage loans (as a percent) 2.40% 2.00%
South Atlantic    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 1,160.1 $ 834.0
Percent of mortgage loans (as a percent) 21.90% 17.80%
East South Central    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 190.2 $ 124.5
Percent of mortgage loans (as a percent) 3.60% 2.70%
West South Central    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 605.9 $ 459.1
Percent of mortgage loans (as a percent) 11.40% 9.80%
Mountain    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 805.1 $ 667.8
Percent of mortgage loans (as a percent) 15.20% 14.20%
Pacific    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments $ 1,428.8 $ 1,349.4
Percent of mortgage loans (as a percent) 26.90% 28.60%
International    
Mortgage loan disclosures    
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments   $ 431.4
Percent of mortgage loans (as a percent)   9.20%