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Investments - Mortgage Loan Credit Monitoring (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Vintage year, Direct financing leases    
2023 $ 46.1  
2022 145.5 $ 147.1
2021 48.8 93.8
2020 111.6 114.4
2019 12.9 15.3
2018   54.6
Prior   239.8
Prior 285.2  
Direct financing leases, Total amortized cost 650.1 665.0
Reinsurance recoverable and deposit receivable 20,614.9 21,445.4
Accrued interest receivable 619.2 578.0
Accrued interest receivable on direct financing leases 1.2 0.0
A- and above    
Vintage year, Direct financing leases    
2023 1.1  
2022 122.0 110.5
2021 12.4 13.0
2020 56.7 39.9
2019 1.3 1.4
2018   42.9
Prior   167.3
Prior 207.3  
Direct financing leases, Total amortized cost 400.8 375.0
BBB+ thru BBB-    
Vintage year, Direct financing leases    
2023 2.8  
2022 23.5 33.9
2021 20.8 21.9
2020 46.9 62.4
2019 11.6 11.9
2018   11.7
Prior   70.4
Prior 76.3  
Direct financing leases, Total amortized cost 181.9 212.2
BB+ thru BB-    
Vintage year, Direct financing leases    
2023 42.2  
2022   2.7
2021 15.6 57.3
2020 8.0 12.1
2019   2.0
Prior   2.1
Prior 1.6  
Direct financing leases, Total amortized cost 67.4 76.2
B+ and below    
Vintage year, Direct financing leases    
2021   1.6
Direct financing leases, Total amortized cost   1.6
Commercial mortgage loans    
Vintage year, Mortgage loans    
2023 1,057.7  
2022 1,775.3 1,526.0
2021 2,755.5 2,734.3
2020 1,802.0 1,967.1
2019 2,410.3 2,628.9
2018   2,444.0
Prior 6,781.0 5,430.0
Mortgage loans, Total amortized cost 16,581.8 16,730.3
Vintage year, Direct financing leases    
Accrued interest receivable 58.3 57.7
Commercial mortgage loans | A- and above    
Vintage year, Mortgage loans    
2023 664.8  
2022 1,277.1 1,036.4
2021 2,364.0 2,277.9
2020 1,587.3 1,807.3
2019 1,954.4 2,210.2
2018   2,187.9
Prior 5,576.6 4,624.9
Mortgage loans, Total amortized cost 13,424.2 14,144.6
Commercial mortgage loans | BBB+ thru BBB-    
Vintage year, Mortgage loans    
2023 282.4  
2022 356.0 385.6
2021 374.8 439.6
2020 212.0 156.8
2019 337.3 418.7
2018   238.9
Prior 911.7 691.7
Mortgage loans, Total amortized cost 2,474.2 2,331.3
Commercial mortgage loans | BB+ thru BB-    
Vintage year, Mortgage loans    
2023 110.5  
2022 142.2 104.0
2021 16.7 16.8
2020 2.7 3.0
2019 35.2  
2018   8.9
Prior 234.2 71.7
Mortgage loans, Total amortized cost 541.5 204.4
Commercial mortgage loans | B+ and below    
Vintage year, Mortgage loans    
2019 83.4  
2018   8.3
Prior 58.5 41.7
Mortgage loans, Total amortized cost 141.9 50.0
Residential mortgage loans    
Vintage year, Mortgage loans    
2023 503.4  
2022 1,068.3 1,152.8
2021 1,346.7 1,745.4
2020 229.7 449.3
2019 122.8 134.7
2018   76.0
Prior 425.6 424.8
Mortgage loans, Total amortized cost 3,696.5 3,983.0
Vintage year, Direct financing leases    
Accrued interest receivable 11.4 19.6
Residential mortgage loans | Performing    
Vintage year, Mortgage loans    
2023 502.3  
2022 1,064.3 1,144.8
2021 1,341.8 1,740.7
2020 228.4 447.1
2019 120.8 133.0
2018   75.4
Prior 421.0 417.8
Mortgage loans, Total amortized cost 3,678.6 3,958.8
Residential mortgage loans | Non-performing    
Vintage year, Mortgage loans    
2023 1.1  
2022 4.0 8.0
2021 4.9 4.7
2020 1.3 2.2
2019 2.0 1.7
2018   0.6
Prior 4.6 7.0
Mortgage loans, Total amortized cost $ 17.9 24.2
Vintage year, Direct financing leases    
Mortgage loans, delinquent to be considered non-performing (in days) 90 days  
Other loans    
Vintage year, Mortgage loans    
2023 $ 168.5  
Prior 0.1  
Mortgage loans, Total amortized cost 168.6  
Vintage year, Direct financing leases    
Accrued interest receivable 1.6 $ 0.0
Other loans | Performing    
Vintage year, Mortgage loans    
2023 168.5  
Mortgage loans, Total amortized cost 168.5  
Other loans | Non-performing    
Vintage year, Mortgage loans    
Prior 0.1  
Mortgage loans, Total amortized cost $ 0.1