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Investments - Mortgage Loans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Commercial mortgage loans      
Mortgage loan disclosures      
Mortgage loans, purchased $ 57.0 $ 33.0  
Mortgage loans, sold 0.8    
Mortgage loans, Total amortized cost $ 16,839.3   $ 16,581.8
Percent of mortgage loans (as a percent) 100.00%   100.00%
Commercial mortgage loans | Office      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 3,530.4   $ 3,643.0
Percent of mortgage loans (as a percent) 20.90%   21.90%
Commercial mortgage loans | Retail      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 1,429.8   $ 1,454.7
Percent of mortgage loans (as a percent) 8.50%   8.80%
Commercial mortgage loans | Industrial      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 3,819.2   $ 3,515.7
Percent of mortgage loans (as a percent) 22.70%   21.20%
Commercial mortgage loans | Apartments      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 7,250.7   $ 7,128.2
Percent of mortgage loans (as a percent) 43.10%   43.00%
Commercial mortgage loans | Hotel      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 67.7   $ 68.6
Percent of mortgage loans (as a percent) 0.40%   0.40%
Commercial mortgage loans | Mixed use/other      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 741.5   $ 771.6
Percent of mortgage loans (as a percent) 4.40%   4.70%
Commercial mortgage loans | New England      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 364.1   $ 366.5
Percent of mortgage loans (as a percent) 2.20%   2.20%
Commercial mortgage loans | Middle Atlantic      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 4,515.7   $ 4,512.6
Percent of mortgage loans (as a percent) 26.90%   27.10%
Commercial mortgage loans | East North Central      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 608.4   $ 583.3
Percent of mortgage loans (as a percent) 3.60%   3.50%
Commercial mortgage loans | West North Central      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 343.4   $ 336.0
Percent of mortgage loans (as a percent) 2.00%   2.00%
Commercial mortgage loans | South Atlantic      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 2,874.8   $ 2,761.9
Percent of mortgage loans (as a percent) 17.10%   16.70%
Commercial mortgage loans | East South Central      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 475.8   $ 429.4
Percent of mortgage loans (as a percent) 2.80%   2.60%
Commercial mortgage loans | West South Central      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 1,334.0   $ 1,268.6
Percent of mortgage loans (as a percent) 7.90%   7.70%
Commercial mortgage loans | Mountain      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 848.2   $ 824.2
Percent of mortgage loans (as a percent) 5.00%   5.00%
Commercial mortgage loans | Pacific      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 5,000.1   $ 4,974.4
Percent of mortgage loans (as a percent) 29.70%   30.00%
Commercial mortgage loans | International      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 474.8   $ 524.9
Percent of mortgage loans (as a percent) 2.80%   3.20%
Residential mortgage loans      
Mortgage loan disclosures      
Mortgage loans, purchased $ 38.4 69.1  
Mortgage loans, sold 4.9 $ 4.2  
Mortgage loans, Total amortized cost $ 3,608.5   $ 3,696.5