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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Commercial mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased |  | $ 74.9 | $ 57.0 | $ 107.9 |
Mortgage loans, sold |  |  | 0.8 |  |
Mortgage loans, Total amortized cost | $ 16,855.7 |  | $ 16,855.7 |  | $ 16,581.8
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 | $ 3,444.6 |  | $ 3,444.6 |  | $ 3,643.0
Percent of mortgage loans (as a percent) | 20.40% |  | 20.40% |  | 21.90%
Commercial mortgage loans | Retail |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,428.2 |  | $ 1,428.2 |  | $ 1,454.7
Percent of mortgage loans (as a percent) | 8.50% |  | 8.50% |  | 8.80%
Commercial mortgage loans | Industrial |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 3,880.0 |  | $ 3,880.0 |  | $ 3,515.7
Percent of mortgage loans (as a percent) | 23.00% |  | 23.00% |  | 21.20%
Commercial mortgage loans | Apartments |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 7,241.6 |  | $ 7,241.6 |  | $ 7,128.2
Percent of mortgage loans (as a percent) | 43.00% |  | 43.00% |  | 43.00%
Commercial mortgage loans | Hotel |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 66.8 |  | $ 66.8 |  | $ 68.6
Percent of mortgage loans (as a percent) | 0.40% |  | 0.40% |  | 0.40%
Commercial mortgage loans | Mixed use/other |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 794.5 |  | $ 794.5 |  | $ 771.6
Percent of mortgage loans (as a percent) | 4.70% |  | 4.70% |  | 4.70%
Commercial mortgage loans | New England |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 352.4 |  | $ 352.4 |  | $ 366.5
Percent of mortgage loans (as a percent) | 2.10% |  | 2.10% |  | 2.20%
Commercial mortgage loans | Middle Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,575.1 |  | $ 4,575.1 |  | $ 4,512.6
Percent of mortgage loans (as a percent) | 27.00% |  | 27.00% |  | 27.10%
Commercial mortgage loans | East North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 590.7 |  | $ 590.7 |  | $ 583.3
Percent of mortgage loans (as a percent) | 3.50% |  | 3.50% |  | 3.50%
Commercial mortgage loans | West North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 352.0 |  | $ 352.0 |  | $ 336.0
Percent of mortgage loans (as a percent) | 2.10% |  | 2.10% |  | 2.00%
Commercial mortgage loans | South Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,874.0 |  | $ 2,874.0 |  | $ 2,761.9
Percent of mortgage loans (as a percent) | 17.10% |  | 17.10% |  | 16.70%
Commercial mortgage loans | East South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 474.5 |  | $ 474.5 |  | $ 429.4
Percent of mortgage loans (as a percent) | 2.80% |  | 2.80% |  | 2.60%
Commercial mortgage loans | West South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,274.2 |  | $ 1,274.2 |  | $ 1,268.6
Percent of mortgage loans (as a percent) | 7.60% |  | 7.60% |  | 7.70%
Commercial mortgage loans | Mountain |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 872.5 |  | $ 872.5 |  | $ 824.2
Percent of mortgage loans (as a percent) | 5.20% |  | 5.20% |  | 5.00%
Commercial mortgage loans | Pacific |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,992.9 |  | $ 4,992.9 |  | $ 4,974.4
Percent of mortgage loans (as a percent) | 29.60% |  | 29.60% |  | 30.00%
Commercial mortgage loans | International |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 497.4 |  | $ 497.4 |  | $ 524.9
Percent of mortgage loans (as a percent) | 3.00% |  | 3.00% |  | 3.20%
Residential mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 49.1 | 353.3 | $ 87.5 | 422.4 |
Mortgage loans, sold | 7.9 | $ 17.1 | 12.8 | $ 21.3 |
Mortgage loans, Total amortized cost | $ 3,571.8 |  | $ 3,571.8 |  | $ 3,696.5

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