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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Commercial mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 1.4 | $ 21.9 | $ 71.7 | $ 78.9 |
Mortgage loans, sold | 0.1 | 3.0 | 109.3 | 3.8 |
Mortgage loans, Total amortized cost | $ 16,648.6 |  | $ 16,648.6 |  | $ 17,072.7
Percent of mortgage loans (as a percent) | 100.00% |  | 100.00% |  | 100.00%
Commercial mortgage loans | Office |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,991.6 |  | $ 2,991.6 |  | $ 3,182.9
Percent of mortgage loans (as a percent) | 18.00% |  | 18.00% |  | 18.50%
Commercial mortgage loans | Retail |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,496.7 |  | $ 1,496.7 |  | $ 1,476.9
Percent of mortgage loans (as a percent) | 9.00% |  | 9.00% |  | 8.70%
Commercial mortgage loans | Industrial |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,231.3 |  | $ 4,231.3 |  | $ 4,364.5
Percent of mortgage loans (as a percent) | 25.40% |  | 25.40% |  | 25.60%
Commercial mortgage loans | Apartments |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 7,097.9 |  | $ 7,097.9 |  | $ 7,220.4
Percent of mortgage loans (as a percent) | 42.60% |  | 42.60% |  | 42.30%
Commercial mortgage loans | Hotel |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 31.3 |  | $ 31.3 |  | $ 65.0
Percent of mortgage loans (as a percent) | 0.20% |  | 0.20% |  | 0.40%
Commercial mortgage loans | Mixed use/other |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 799.8 |  | $ 799.8 |  | $ 763.0
Percent of mortgage loans (as a percent) | 4.80% |  | 4.80% |  | 4.50%
Commercial mortgage loans | New England |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 447.8 |  | $ 447.8 |  | $ 347.2
Percent of mortgage loans (as a percent) | 2.70% |  | 2.70% |  | 2.00%
Commercial mortgage loans | Middle Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,421.0 |  | $ 4,421.0 |  | $ 4,714.9
Percent of mortgage loans (as a percent) | 26.50% |  | 26.50% |  | 27.70%
Commercial mortgage loans | East North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 471.3 |  | $ 471.3 |  | $ 591.0
Percent of mortgage loans (as a percent) | 2.80% |  | 2.80% |  | 3.50%
Commercial mortgage loans | West North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 376.3 |  | $ 376.3 |  | $ 394.0
Percent of mortgage loans (as a percent) | 2.30% |  | 2.30% |  | 2.30%
Commercial mortgage loans | South Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 3,140.9 |  | $ 3,140.9 |  | $ 2,987.7
Percent of mortgage loans (as a percent) | 18.90% |  | 18.90% |  | 17.50%
Commercial mortgage loans | East South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 419.9 |  | $ 419.9 |  | $ 417.7
Percent of mortgage loans (as a percent) | 2.50% |  | 2.50% |  | 2.40%
Commercial mortgage loans | West South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,308.1 |  | $ 1,308.1 |  | $ 1,310.5
Percent of mortgage loans (as a percent) | 7.90% |  | 7.90% |  | 7.70%
Commercial mortgage loans | Mountain |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,166.8 |  | $ 1,166.8 |  | $ 979.5
Percent of mortgage loans (as a percent) | 7.00% |  | 7.00% |  | 5.70%
Commercial mortgage loans | Pacific |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,404.5 |  | $ 4,404.5 |  | $ 4,851.9
Percent of mortgage loans (as a percent) | 26.40% |  | 26.40% |  | 28.40%
Commercial mortgage loans | International |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 492.0 |  | $ 492.0 |  | $ 478.3
Percent of mortgage loans (as a percent) | 3.00% |  | 3.00% |  | 2.80%
Residential mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 376.7 | 112.3 | $ 1,027.6 | 199.8 |
Mortgage loans, sold | 11.1 | $ 9.4 | 20.9 | $ 22.2 |
Mortgage loans, Total amortized cost | $ 4,255.6 |  | $ 4,255.6 |  | $ 3,607.4

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