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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Commercial mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 0.5 | $ 98.2 | $ 108.4 | $ 144.4 |
Mortgage loans, sold |  | 0.1 |  | 0.1 |
Mortgage loans, Total amortized cost | $ 16,447.7 |  | $ 16,447.7 |  | $ 16,730.3
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 | $ 3,676.3 |  | $ 3,676.3 |  | $ 4,322.0
Percent of mortgage loans (as a percent) | 22.30% |  | 22.30% |  | 25.90%
Commercial mortgage loans | Retail |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,503.4 |  | $ 1,503.4 |  | $ 1,499.4
Percent of mortgage loans (as a percent) | 9.10% |  | 9.10% |  | 9.00%
Commercial mortgage loans | Industrial |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 3,507.4 |  | $ 3,507.4 |  | $ 3,235.9
Percent of mortgage loans (as a percent) | 21.30% |  | 21.30% |  | 19.30%
Commercial mortgage loans | Apartments |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 6,925.7 |  | $ 6,925.7 |  | $ 6,827.1
Percent of mortgage loans (as a percent) | 42.20% |  | 42.20% |  | 40.80%
Commercial mortgage loans | Hotel |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 69.5 |  | $ 69.5 |  | $ 72.5
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 | $ 765.4 |  | $ 765.4 |  | $ 773.4
Percent of mortgage loans (as a percent) | 4.70% |  | 4.70% |  | 4.60%
Commercial mortgage loans | New England |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 377.8 |  | $ 377.8 |  | $ 512.1
Percent of mortgage loans (as a percent) | 2.30% |  | 2.30% |  | 3.10%
Commercial mortgage loans | Middle Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,446.5 |  | $ 4,446.5 |  | $ 4,505.6
Percent of mortgage loans (as a percent) | 26.90% |  | 26.90% |  | 26.90%
Commercial mortgage loans | East North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 586.7 |  | $ 586.7 |  | $ 652.5
Percent of mortgage loans (as a percent) | 3.60% |  | 3.60% |  | 3.90%
Commercial mortgage loans | West North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 330.7 |  | $ 330.7 |  | $ 370.9
Percent of mortgage loans (as a percent) | 2.00% |  | 2.00% |  | 2.20%
Commercial mortgage loans | South Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,640.8 |  | $ 2,640.8 |  | $ 2,558.3
Percent of mortgage loans (as a percent) | 16.10% |  | 16.10% |  | 15.30%
Commercial mortgage loans | East South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 432.2 |  | $ 432.2 |  | $ 339.8
Percent of mortgage loans (as a percent) | 2.60% |  | 2.60% |  | 2.00%
Commercial mortgage loans | West South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,259.5 |  | $ 1,259.5 |  | $ 1,204.9
Percent of mortgage loans (as a percent) | 7.70% |  | 7.70% |  | 7.20%
Commercial mortgage loans | Mountain |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 858.5 |  | $ 858.5 |  | $ 938.7
Percent of mortgage loans (as a percent) | 5.20% |  | 5.20% |  | 5.60%
Commercial mortgage loans | Pacific |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,997.4 |  | $ 4,997.4 |  | $ 5,115.3
Percent of mortgage loans (as a percent) | 30.50% |  | 30.50% |  | 30.60%
Commercial mortgage loans | International |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 517.6 |  | $ 517.6 |  | $ 532.2
Percent of mortgage loans (as a percent) | 3.10% |  | 3.10% |  | 3.20%
Residential mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 74.6 | 476.1 | $ 497.0 | 1,657.5 |
Mortgage loans, sold | 4.1 | $ 4.8 | 25.4 | $ 490.8 |
Mortgage loans, Total amortized cost | $ 3,896.7 |  | $ 3,896.7 |  | $ 3,983.0

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