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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 20,086.4 |  | $ 20,086.4 |  | $ 18,103.9
Commercial mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | 1.5 | $ 65.0 | 106.3 | $ 151.3 |
Mortgage loans, sold |  | 3.3 | 66.3 | 4.4 |
Mortgage loans, Total amortized cost | $ 16,332.6 |  | $ 16,332.6 |  | $ 15,441.6
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 | $ 4,839.0 |  | $ 4,839.0 |  | $ 4,491.7
Percent of mortgage loans (as a percent) | 29.70% |  | 29.70% |  | 29.00%
Commercial mortgage loans | Retail |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,689.7 |  | $ 1,689.7 |  | $ 1,815.3
Percent of mortgage loans (as a percent) | 10.30% |  | 10.30% |  | 11.80%
Commercial mortgage loans | Industrial |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,970.6 |  | $ 2,970.6 |  | $ 2,488.7
Percent of mortgage loans (as a percent) | 18.20% |  | 18.20% |  | 16.10%
Commercial mortgage loans | Apartments |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 6,059.0 |  | $ 6,059.0 |  | $ 5,958.0
Percent of mortgage loans (as a percent) | 37.10% |  | 37.10% |  | 38.60%
Commercial mortgage loans | Hotel |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 86.6 |  | $ 86.6 |  | $ 89.4
Percent of mortgage loans (as a percent) | 0.50% |  | 0.50% |  | 0.60%
Commercial mortgage loans | Mixed use/other |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 687.7 |  | $ 687.7 |  | $ 598.5
Percent of mortgage loans (as a percent) | 4.20% |  | 4.20% |  | 3.90%
Commercial mortgage loans | New England |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 588.4 |  | $ 588.4 |  | $ 593.9
Percent of mortgage loans (as a percent) | 3.60% |  | 3.60% |  | 3.80%
Commercial mortgage loans | Middle Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,508.0 |  | $ 4,508.0 |  | $ 4,438.2
Percent of mortgage loans (as a percent) | 27.50% |  | 27.50% |  | 28.80%
Commercial mortgage loans | East North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 596.4 |  | $ 596.4 |  | $ 572.6
Percent of mortgage loans (as a percent) | 3.70% |  | 3.70% |  | 3.70%
Commercial mortgage loans | West North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 290.4 |  | $ 290.4 |  | $ 267.5
Percent of mortgage loans (as a percent) | 1.80% |  | 1.80% |  | 1.70%
Commercial mortgage loans | South Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,455.1 |  | $ 2,455.1 |  | $ 2,368.9
Percent of mortgage loans (as a percent) | 15.00% |  | 15.00% |  | 15.30%
Commercial mortgage loans | East South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 374.9 |  | $ 374.9 |  | $ 316.6
Percent of mortgage loans (as a percent) | 2.30% |  | 2.30% |  | 2.10%
Commercial mortgage loans | West South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,249.6 |  | $ 1,249.6 |  | $ 1,315.9
Percent of mortgage loans (as a percent) | 7.70% |  | 7.70% |  | 8.50%
Commercial mortgage loans | Mountain |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,006.9 |  | $ 1,006.9 |  | $ 936.2
Percent of mortgage loans (as a percent) | 6.20% |  | 6.20% |  | 6.10%
Commercial mortgage loans | Pacific |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,825.0 |  | $ 4,825.0 |  | $ 4,183.0
Percent of mortgage loans (as a percent) | 29.50% |  | 29.50% |  | 27.10%
Commercial mortgage loans | International |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 437.9 |  | $ 437.9 |  | $ 448.8
Percent of mortgage loans (as a percent) | 2.70% |  | 2.70% |  | 2.90%
Residential mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 1,142.0 | 242.0 | $ 1,955.0 | 736.5 |
Mortgage loans, sold | 29.5 | $ 24.6 | 73.1 | $ 98.0 |
Mortgage loans, Total amortized cost | $ 3,130.4 |  | $ 3,130.4 |  | $ 1,951.5

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