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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Commercial mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 74.9 | $ 13.5 | $ 107.9 | $ 46.2 |
Mortgage loans, Total amortized cost | $ 16,549.6 |  | $ 16,549.6 |  | $ 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 | $ 3,895.3 |  | $ 3,895.3 |  | $ 4,322.0
Percent of mortgage loans (as a percent) | 23.60% |  | 23.60% |  | 25.90%
Commercial mortgage loans | Retail |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,496.5 |  | $ 1,496.5 |  | $ 1,499.4
Percent of mortgage loans (as a percent) | 9.00% |  | 9.00% |  | 9.00%
Commercial mortgage loans | Industrial |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 3,382.1 |  | $ 3,382.1 |  | $ 3,235.9
Percent of mortgage loans (as a percent) | 20.40% |  | 20.40% |  | 19.30%
Commercial mortgage loans | Apartments |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 6,889.2 |  | $ 6,889.2 |  | $ 6,827.1
Percent of mortgage loans (as a percent) | 41.70% |  | 41.70% |  | 40.80%
Commercial mortgage loans | Hotel |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 70.4 |  | $ 70.4 |  | $ 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 | $ 816.1 |  | $ 816.1 |  | $ 773.4
Percent of mortgage loans (as a percent) | 4.90% |  | 4.90% |  | 4.60%
Commercial mortgage loans | New England |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 504.7 |  | $ 504.7 |  | $ 512.1
Percent of mortgage loans (as a percent) | 3.00% |  | 3.00% |  | 3.10%
Commercial mortgage loans | Middle Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,409.7 |  | $ 4,409.7 |  | $ 4,505.6
Percent of mortgage loans (as a percent) | 26.70% |  | 26.70% |  | 26.90%
Commercial mortgage loans | East North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 677.1 |  | $ 677.1 |  | $ 652.5
Percent of mortgage loans (as a percent) | 4.10% |  | 4.10% |  | 3.90%
Commercial mortgage loans | West North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 332.9 |  | $ 332.9 |  | $ 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 | $ 2,583.3 |  | $ 2,583.3 |  | $ 2,558.3
Percent of mortgage loans (as a percent) | 15.60% |  | 15.60% |  | 15.30%
Commercial mortgage loans | East South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 380.7 |  | $ 380.7 |  | $ 339.8
Percent of mortgage loans (as a percent) | 2.30% |  | 2.30% |  | 2.00%
Commercial mortgage loans | West South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,213.3 |  | $ 1,213.3 |  | $ 1,204.9
Percent of mortgage loans (as a percent) | 7.30% |  | 7.30% |  | 7.20%
Commercial mortgage loans | Mountain |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 901.3 |  | $ 901.3 |  | $ 938.7
Percent of mortgage loans (as a percent) | 5.40% |  | 5.40% |  | 5.60%
Commercial mortgage loans | Pacific |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,969.4 |  | $ 4,969.4 |  | $ 5,115.3
Percent of mortgage loans (as a percent) | 30.10% |  | 30.10% |  | 30.60%
Commercial mortgage loans | International |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 577.2 |  | $ 577.2 |  | $ 532.2
Percent of mortgage loans (as a percent) | 3.50% |  | 3.50% |  | 3.20%
Residential mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 353.3 | 647.1 | $ 422.4 | 1,181.4 |
Mortgage loans, sold | 17.1 | $ 478.9 | 21.3 | $ 486.0 |
Mortgage loans, Total amortized cost | $ 3,968.0 |  | $ 3,968.0 |  | $ 3,983.0

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