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Investments - Mortgage Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Commercial mortgage loans      
Mortgage loan disclosures      
Mortgage loans, purchased $ 109.2 $ 325.4 $ 118.2
Mortgage loans, sold 12.1 15.6 73.8
Mortgage loans, Total amortized cost $ 16,581.8 $ 16,730.3  
Percent of mortgage loans (as a percent) 100.00% 100.00%  
Commercial mortgage loans | Office      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 3,643.0 $ 4,322.0  
Percent of mortgage loans (as a percent) 21.90% 25.90%  
Commercial mortgage loans | Retail      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 1,454.7 $ 1,499.4  
Percent of mortgage loans (as a percent) 8.80% 9.00%  
Commercial mortgage loans | Industrial      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 3,515.7 $ 3,235.9  
Percent of mortgage loans (as a percent) 21.20% 19.30%  
Commercial mortgage loans | Apartments      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 7,128.2 $ 6,827.1  
Percent of mortgage loans (as a percent) 43.00% 40.80%  
Commercial mortgage loans | Hotel      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 68.6 $ 72.5  
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 $ 771.6 $ 773.4  
Percent of mortgage loans (as a percent) 4.70% 4.60%  
Commercial mortgage loans | New England      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 366.5 $ 512.1  
Percent of mortgage loans (as a percent) 2.20% 3.10%  
Commercial mortgage loans | Middle Atlantic      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 4,512.6 $ 4,505.6  
Percent of mortgage loans (as a percent) 27.10% 26.90%  
Commercial mortgage loans | East North Central      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 583.3 $ 652.5  
Percent of mortgage loans (as a percent) 3.50% 3.90%  
Commercial mortgage loans | West North Central      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 336.0 $ 370.9  
Percent of mortgage loans (as a percent) 2.00% 2.20%  
Commercial mortgage loans | South Atlantic      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 2,761.9 $ 2,558.3  
Percent of mortgage loans (as a percent) 16.70% 15.30%  
Commercial mortgage loans | East South Central      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 429.4 $ 339.8  
Percent of mortgage loans (as a percent) 2.60% 2.00%  
Commercial mortgage loans | West South Central      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 1,268.6 $ 1,204.9  
Percent of mortgage loans (as a percent) 7.70% 7.20%  
Commercial mortgage loans | Mountain      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 824.2 $ 938.7  
Percent of mortgage loans (as a percent) 5.00% 5.60%  
Commercial mortgage loans | Pacific      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 4,974.4 $ 5,115.3  
Percent of mortgage loans (as a percent) 30.00% 30.60%  
Commercial mortgage loans | International      
Mortgage loan disclosures      
Mortgage loans, Total amortized cost $ 524.9 $ 532.2  
Percent of mortgage loans (as a percent) 3.20% 3.20%  
Residential mortgage loans      
Mortgage loan disclosures      
Mortgage loans, purchased $ 554.7 $ 1,846.0 2,370.9
Mortgage loans, sold 115.9 535.7 $ 88.9
Mortgage loans, Total amortized cost $ 3,696.5 $ 3,983.0