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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Commercial mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 98.2 | $ 1.5 | $ 144.4 | $ 106.3 |
Mortgage loans, sold | 0.1 |  | 0.1 | 66.3 |
Mortgage loans, Total amortized cost | $ 16,557.3 |  | $ 16,557.3 |  | $ 16,394.7
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 | $ 4,309.4 |  | $ 4,309.4 |  | $ 4,789.8
Percent of mortgage loans (as a percent) | 26.00% |  | 26.00% |  | 29.30%
Commercial mortgage loans | Retail |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,553.2 |  | $ 1,553.2 |  | $ 1,622.1
Percent of mortgage loans (as a percent) | 9.40% |  | 9.40% |  | 9.90%
Commercial mortgage loans | Industrial |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 3,220.9 |  | $ 3,220.9 |  | $ 2,966.4
Percent of mortgage loans (as a percent) | 19.50% |  | 19.50% |  | 18.10%
Commercial mortgage loans | Apartments |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 6,696.2 |  | $ 6,696.2 |  | $ 6,234.3
Percent of mortgage loans (as a percent) | 40.40% |  | 40.40% |  | 38.00%
Commercial mortgage loans | Hotel |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 73.6 |  | $ 73.6 |  | $ 85.7
Percent of mortgage loans (as a percent) | 0.40% |  | 0.40% |  | 0.50%
Commercial mortgage loans | Mixed use/other |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 704.0 |  | $ 704.0 |  | $ 696.4
Percent of mortgage loans (as a percent) | 4.30% |  | 4.30% |  | 4.20%
Commercial mortgage loans | New England |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 519.3 |  | $ 519.3 |  | $ 585.6
Percent of mortgage loans (as a percent) | 3.10% |  | 3.10% |  | 3.60%
Commercial mortgage loans | Middle Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,594.6 |  | $ 4,594.6 |  | $ 4,536.5
Percent of mortgage loans (as a percent) | 27.70% |  | 27.70% |  | 27.70%
Commercial mortgage loans | East North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 625.7 |  | $ 625.7 |  | $ 623.9
Percent of mortgage loans (as a percent) | 3.80% |  | 3.80% |  | 3.80%
Commercial mortgage loans | West North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 366.5 |  | $ 366.5 |  | $ 338.6
Percent of mortgage loans (as a percent) | 2.20% |  | 2.20% |  | 2.10%
Commercial mortgage loans | South Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,482.9 |  | $ 2,482.9 |  | $ 2,464.9
Percent of mortgage loans (as a percent) | 15.00% |  | 15.00% |  | 15.00%
Commercial mortgage loans | East South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 330.3 |  | $ 330.3 |  | $ 378.9
Percent of mortgage loans (as a percent) | 2.00% |  | 2.00% |  | 2.30%
Commercial mortgage loans | West South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,136.3 |  | $ 1,136.3 |  | $ 1,243.7
Percent of mortgage loans (as a percent) | 6.90% |  | 6.90% |  | 7.60%
Commercial mortgage loans | Mountain |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 927.0 |  | $ 927.0 |  | $ 925.6
Percent of mortgage loans (as a percent) | 5.60% |  | 5.60% |  | 5.60%
Commercial mortgage loans | Pacific |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 5,113.0 |  | $ 5,113.0 |  | $ 4,864.4
Percent of mortgage loans (as a percent) | 30.90% |  | 30.90% |  | 29.70%
Commercial mortgage loans | International |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 461.7 |  | $ 461.7 |  | $ 432.6
Percent of mortgage loans (as a percent) | 2.80% |  | 2.80% |  | 2.60%
Residential mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 476.1 | 1,142.0 | $ 1,657.5 | 1,955.0 |
Mortgage loans, sold | 4.8 | $ 29.5 | 490.8 | $ 73.1 |
Mortgage loans, Total amortized cost | $ 4,113.4 |  | $ 4,113.4 |  | $ 3,319.9

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