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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 19,153.6 |  | $ 19,153.6 |  | $ 18,103.9
Commercial mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | 15.6 | $ 73.5 | 104.8 | $ 86.3 |
Mortgage loans, sold |  |  | 66.3 | 1.1 |
Mortgage loans, Total amortized cost | $ 16,161.5 |  | $ 16,161.5 |  | $ 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 | $ 4,581.6 |  | $ 4,581.6 |  | $ 4,491.7
Percent of mortgage loans (as a percent) | 28.40% |  | 28.40% |  | 29.00%
Commercial mortgage loans | Retail |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,699.1 |  | $ 1,699.1 |  | $ 1,815.3
Percent of mortgage loans (as a percent) | 10.50% |  | 10.50% |  | 11.80%
Commercial mortgage loans | Industrial |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 2,939.7 |  | $ 2,939.7 |  | $ 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 | $ 6,189.5 |  | $ 6,189.5 |  | $ 5,958.0
Percent of mortgage loans (as a percent) | 38.30% |  | 38.30% |  | 38.60%
Commercial mortgage loans | Hotel |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 87.7 |  | $ 87.7 |  | $ 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 | $ 663.9 |  | $ 663.9 |  | $ 598.5
Percent of mortgage loans (as a percent) | 4.10% |  | 4.10% |  | 3.90%
Commercial mortgage loans | New England |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 659.4 |  | $ 659.4 |  | $ 593.9
Percent of mortgage loans (as a percent) | 4.10% |  | 4.10% |  | 3.80%
Commercial mortgage loans | Middle Atlantic |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,523.0 |  | $ 4,523.0 |  | $ 4,438.2
Percent of mortgage loans (as a percent) | 27.90% |  | 27.90% |  | 28.80%
Commercial mortgage loans | East North Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 604.6 |  | $ 604.6 |  | $ 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 | $ 283.3 |  | $ 283.3 |  | $ 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 | $ 2,399.9 |  | $ 2,399.9 |  | $ 2,368.9
Percent of mortgage loans (as a percent) | 14.80% |  | 14.80% |  | 15.30%
Commercial mortgage loans | East South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 349.0 |  | $ 349.0 |  | $ 316.6
Percent of mortgage loans (as a percent) | 2.20% |  | 2.20% |  | 2.10%
Commercial mortgage loans | West South Central |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,349.6 |  | $ 1,349.6 |  | $ 1,315.9
Percent of mortgage loans (as a percent) | 8.40% |  | 8.40% |  | 8.50%
Commercial mortgage loans | Mountain |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 1,033.1 |  | $ 1,033.1 |  | $ 936.2
Percent of mortgage loans (as a percent) | 6.40% |  | 6.40% |  | 6.10%
Commercial mortgage loans | Pacific |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 4,477.1 |  | $ 4,477.1 |  | $ 4,183.0
Percent of mortgage loans (as a percent) | 27.70% |  | 27.70% |  | 27.10%
Commercial mortgage loans | International |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, Total amortized cost | $ 482.5 |  | $ 482.5 |  | $ 448.8
Percent of mortgage loans (as a percent) | 3.00% |  | 3.00% |  | 2.90%
Residential mortgage loans |  |  |  |  |
Mortgage loan disclosures |  |  |  |  |
Mortgage loans, purchased | $ 162.0 | 267.7 | $ 813.0 | 494.5 |
Mortgage loans, sold | 6.6 | $ 48.5 | 43.6 | $ 73.4 |
Mortgage loans, Total amortized cost | $ 2,298.1 |  | $ 2,298.1 |  | $ 1,951.5

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