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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 17,562.2 | $ 16,520.4 | $ 17,562.2 | $ 16,520.4 | $ 16,513.9
Commercial mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | 65.0 | 40.0 | 151.3 | 155.9 |
Mortgage loans, sold | 3.3 | 1.1 | 4.4 | 1.6 |
Mortgage loans, Total amortized cost | $ 15,207.2 | 15,018.6 | $ 15,207.2 | 15,018.6 | $ 15,017.2
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 | $ 4,630.2 |  | $ 4,630.2 |  | $ 4,887.1
Percent of mortgage loans (as a percent) | 30.30% |  | 30.30% |  | 32.60%
Commercial mortgage loans | Retail |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,878.2 |  | $ 1,878.2 |  | $ 2,052.6
Percent of mortgage loans (as a percent) | 12.40% |  | 12.40% |  | 13.70%
Commercial mortgage loans | Industrial |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,281.2 |  | $ 2,281.2 |  | $ 2,268.5
Percent of mortgage loans (as a percent) | 15.00% |  | 15.00% |  | 15.10%
Commercial mortgage loans | Apartments |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 5,787.8 |  | $ 5,787.8 |  | $ 5,246.9
Percent of mortgage loans (as a percent) | 38.10% |  | 38.10% |  | 34.90%
Commercial mortgage loans | Hotel |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 89.9 |  | $ 89.9 |  | $ 90.8
Percent of mortgage loans (as a percent) | 0.60% |  | 0.60% |  | 0.60%
Commercial mortgage loans | Mixed use/other |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 539.9 |  | $ 539.9 |  | $ 471.3
Percent of mortgage loans (as a percent) | 3.60% |  | 3.60% |  | 3.10%
Commercial mortgage loans | New England |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 665.1 |  | $ 665.1 |  | $ 613.9
Percent of mortgage loans (as a percent) | 4.40% |  | 4.40% |  | 4.10%
Commercial mortgage loans | Middle Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,209.9 |  | $ 4,209.9 |  | $ 4,139.7
Percent of mortgage loans (as a percent) | 27.70% |  | 27.70% |  | 27.50%
Commercial mortgage loans | East North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 593.0 |  | $ 593.0 |  | $ 624.5
Percent of mortgage loans (as a percent) | 3.90% |  | 3.90% |  | 4.20%
Commercial mortgage loans | West North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 262.0 |  | $ 262.0 |  | $ 237.2
Percent of mortgage loans (as a percent) | 1.70% |  | 1.70% |  | 1.60%
Commercial mortgage loans | South Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,332.2 |  | $ 2,332.2 |  | $ 2,318.4
Percent of mortgage loans (as a percent) | 15.30% |  | 15.30% |  | 15.40%
Commercial mortgage loans | East South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 319.0 |  | $ 319.0 |  | $ 438.5
Percent of mortgage loans (as a percent) | 2.10% |  | 2.10% |  | 2.90%
Commercial mortgage loans | West South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,340.0 |  | $ 1,340.0 |  | $ 1,450.0
Percent of mortgage loans (as a percent) | 8.80% |  | 8.80% |  | 9.70%
Commercial mortgage loans | Mountain |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 934.1 |  | $ 934.1 |  | $ 931.8
Percent of mortgage loans (as a percent) | 6.10% |  | 6.10% |  | 6.20%
Commercial mortgage loans | Pacific |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,162.4 |  | $ 4,162.4 |  | $ 3,963.7
Percent of mortgage loans (as a percent) | 27.40% |  | 27.40% |  | 26.40%
Commercial mortgage loans | International |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 389.5 |  | $ 389.5 |  | $ 299.5
Percent of mortgage loans (as a percent) | 2.60% |  | 2.60% |  | 2.00%
Residential mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 242.0 | 279.4 | $ 736.5 | 378.8 |
Mortgage loans, sold | 24.6 | 13.3 | 98.0 | 45.4 |
Mortgage loans, Total amortized cost | 1,716.3 | $ 1,501.8 | 1,716.3 | $ 1,501.8 | $ 1,496.7
Direct financing leases |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 638.7 |  | $ 638.7 |  |

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