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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Commercial mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 30.4 |  | $ 70.3 | $ 57.0 |
Mortgage loans, sold | 40.3 |  | 109.2 | 0.8 |
Mortgage loans, Total amortized cost | $ 16,829.3 |  | $ 16,829.3 |  | $ 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 | $ 3,151.8 |  | $ 3,151.8 |  | $ 3,182.9
Percent of mortgage loans (as a percent) | 18.70% |  | 18.70% |  | 18.50%
Commercial mortgage loans | Retail |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,426.3 |  | $ 1,426.3 |  | $ 1,476.9
Percent of mortgage loans (as a percent) | 8.50% |  | 8.50% |  | 8.70%
Commercial mortgage loans | Industrial |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,363.1 |  | $ 4,363.1 |  | $ 4,364.5
Percent of mortgage loans (as a percent) | 25.90% |  | 25.90% |  | 25.60%
Commercial mortgage loans | Apartments |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 7,072.7 |  | $ 7,072.7 |  | $ 7,220.4
Percent of mortgage loans (as a percent) | 42.00% |  | 42.00% |  | 42.30%
Commercial mortgage loans | Hotel |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 31.5 |  | $ 31.5 |  | $ 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 | $ 783.9 |  | $ 783.9 |  | $ 763.0
Percent of mortgage loans (as a percent) | 4.70% |  | 4.70% |  | 4.50%
Commercial mortgage loans | New England |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 355.4 |  | $ 355.4 |  | $ 347.2
Percent of mortgage loans (as a percent) | 2.10% |  | 2.10% |  | 2.00%
Commercial mortgage loans | Middle Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,633.7 |  | $ 4,633.7 |  | $ 4,714.9
Percent of mortgage loans (as a percent) | 27.60% |  | 27.60% |  | 27.70%
Commercial mortgage loans | East North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 466.5 |  | $ 466.5 |  | $ 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 | $ 378.4 |  | $ 378.4 |  | $ 394.0
Percent of mortgage loans (as a percent) | 2.20% |  | 2.20% |  | 2.30%
Commercial mortgage loans | South Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,995.9 |  | $ 2,995.9 |  | $ 2,987.7
Percent of mortgage loans (as a percent) | 17.80% |  | 17.80% |  | 17.50%
Commercial mortgage loans | East South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 420.7 |  | $ 420.7 |  | $ 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 | $ 1,357.1 |  | $ 1,357.1 |  | $ 1,310.5
Percent of mortgage loans (as a percent) | 8.10% |  | 8.10% |  | 7.70%
Commercial mortgage loans | Mountain |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,064.4 |  | $ 1,064.4 |  | $ 979.5
Percent of mortgage loans (as a percent) | 6.30% |  | 6.30% |  | 5.70%
Commercial mortgage loans | Pacific |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,650.6 |  | $ 4,650.6 |  | $ 4,851.9
Percent of mortgage loans (as a percent) | 27.60% |  | 27.60% |  | 28.40%
Commercial mortgage loans | International |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 506.6 |  | $ 506.6 |  | $ 478.3
Percent of mortgage loans (as a percent) | 3.00% |  | 3.00% |  | 2.80%
Residential mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 385.9 | $ 49.1 | $ 650.9 | 87.5 |
Mortgage loans, sold | 5.9 | $ 7.9 | 9.8 | $ 12.8 |
Mortgage loans, Total amortized cost | $ 4,044.9 |  | $ 4,044.9 |  | $ 3,607.4

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