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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Commercial mortgage loans |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, purchased | $ 109.2 | $ 325.4 | $ 118.2
Mortgage loans, sold | 12.1 | 15.6 | 73.8
Mortgage loans, Total amortized cost | $ 16,581.8 | $ 16,730.3 |
Percent of mortgage loans (as a percent) | 100.00% | 100.00% |
Commercial mortgage loans | Office |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 3,643.0 | $ 4,322.0 |
Percent of mortgage loans (as a percent) | 21.90% | 25.90% |
Commercial mortgage loans | Retail |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 1,454.7 | $ 1,499.4 |
Percent of mortgage loans (as a percent) | 8.80% | 9.00% |
Commercial mortgage loans | Industrial |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 3,515.7 | $ 3,235.9 |
Percent of mortgage loans (as a percent) | 21.20% | 19.30% |
Commercial mortgage loans | Apartments |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 7,128.2 | $ 6,827.1 |
Percent of mortgage loans (as a percent) | 43.00% | 40.80% |
Commercial mortgage loans | Hotel |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 68.6 | $ 72.5 |
Percent of mortgage loans (as a percent) | 0.40% | 0.40% |
Commercial mortgage loans | Mixed use/other |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 771.6 | $ 773.4 |
Percent of mortgage loans (as a percent) | 4.70% | 4.60% |
Commercial mortgage loans | New England |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 366.5 | $ 512.1 |
Percent of mortgage loans (as a percent) | 2.20% | 3.10% |
Commercial mortgage loans | Middle Atlantic |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 4,512.6 | $ 4,505.6 |
Percent of mortgage loans (as a percent) | 27.10% | 26.90% |
Commercial mortgage loans | East North Central |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 583.3 | $ 652.5 |
Percent of mortgage loans (as a percent) | 3.50% | 3.90% |
Commercial mortgage loans | West North Central |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 336.0 | $ 370.9 |
Percent of mortgage loans (as a percent) | 2.00% | 2.20% |
Commercial mortgage loans | South Atlantic |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 2,761.9 | $ 2,558.3 |
Percent of mortgage loans (as a percent) | 16.70% | 15.30% |
Commercial mortgage loans | East South Central |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 429.4 | $ 339.8 |
Percent of mortgage loans (as a percent) | 2.60% | 2.00% |
Commercial mortgage loans | West South Central |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 1,268.6 | $ 1,204.9 |
Percent of mortgage loans (as a percent) | 7.70% | 7.20% |
Commercial mortgage loans | Mountain |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 824.2 | $ 938.7 |
Percent of mortgage loans (as a percent) | 5.00% | 5.60% |
Commercial mortgage loans | Pacific |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 4,974.4 | $ 5,115.3 |
Percent of mortgage loans (as a percent) | 30.00% | 30.60% |
Commercial mortgage loans | International |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 524.9 | $ 532.2 |
Percent of mortgage loans (as a percent) | 3.20% | 3.20% |
Residential mortgage loans |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, purchased | $ 554.7 | $ 1,846.0 | 2,370.9
Mortgage loans, sold | 115.9 | 535.7 | $ 88.9
Mortgage loans, Total amortized cost | $ 3,696.5 | $ 3,983.0 |

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