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Investments - Mortgage Loan Credit Monitoring (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Vintage year, Direct financing leases    
2022 $ 120.9  
2021 71.2 $ 94.2
2020 103.4 113.1
2019 13.5 25.3
2018 47.9 57.3
2017   32.1
Prior 226.7 287.9
Direct financing leases, Total amortized cost 583.6 609.9
Reinsurance recoverable and deposit receivable 22,895.6 1,189.3
Accrued interest receivable 594.2 542.6
Accrued interest receivable on direct financing leases 1.1 1.2
A- and above    
Vintage year, Direct financing leases    
2022 91.2  
2021 1.0 11.7
2020 35.0 41.8
2019 1.3 1.4
2018 37.7 39.4
2017   16.6
Prior 163.1 235.6
Direct financing leases, Total amortized cost 329.3 346.5
BBB+ thru BBB-    
Vintage year, Direct financing leases    
2022 29.7  
2021 19.1 30.2
2020 55.6 57.9
2019 10.4 22.0
2018 10.2 17.9
2017   15.5
Prior 61.7 50.2
Direct financing leases, Total amortized cost 186.7 193.7
BB+ thru BB-    
Vintage year, Direct financing leases    
2021 49.8 50.8
2020 12.8 13.4
2019 1.8 1.9
Prior 1.9 2.1
Direct financing leases, Total amortized cost 66.3 68.2
B+ and below    
Vintage year, Direct financing leases    
2021 1.3 1.5
Direct financing leases, Total amortized cost 1.3 1.5
Commercial mortgage loans    
Vintage year, Mortgage loans    
2022 1,226.9  
2021 2,670.2 2,587.3
2020 2,001.5 2,033.6
2019 2,628.4 2,706.9
2018 2,450.7 2,523.5
2017   1,739.3
Prior 5,579.6 4,804.1
Mortgage loans, Total amortized cost 16,557.3 16,394.7
Vintage year, Direct financing leases    
Accrued interest receivable 56.5 60.7
Commercial mortgage loans | A- and above    
Vintage year, Mortgage loans    
2022 1,028.5  
2021 2,263.6 2,275.9
2020 1,789.7 1,722.7
2019 2,240.9 2,412.9
2018 2,243.8 2,383.3
2017   1,437.2
Prior 4,919.7 4,334.2
Mortgage loans, Total amortized cost 14,486.2 14,566.2
Commercial mortgage loans | BBB+ thru BBB-    
Vintage year, Mortgage loans    
2022 190.3  
2021 353.2 278.6
2020 206.7 305.6
2019 387.5 294.0
2018 198.4 131.4
2017   302.1
Prior 563.8 380.0
Mortgage loans, Total amortized cost 1,899.9 1,691.7
Commercial mortgage loans | BB+ thru BB-    
Vintage year, Mortgage loans    
2022 8.1  
2021 53.4 32.8
2020 5.1 5.3
Prior 57.0 55.4
Mortgage loans, Total amortized cost 123.6 93.5
Commercial mortgage loans | B+ and below    
Vintage year, Mortgage loans    
2018 8.5 8.8
Prior 39.1 34.5
Mortgage loans, Total amortized cost 47.6 43.3
Residential mortgage loans    
Vintage year, Mortgage loans    
2022 978.7  
2021 2,058.2 2,039.1
2020 447.7 511.9
2019 132.2 156.2
2018 74.6 91.2
2017   103.2
Prior 422.0 418.3
Mortgage loans, Total amortized cost 4,113.4 3,319.9
Vintage year, Direct financing leases    
Accrued interest receivable 18.5 16.7
Residential mortgage loans | Performing    
Vintage year, Mortgage loans    
2022 978.7  
2021 2,054.6 2,039.1
2020 444.6 510.1
2019 130.9 155.6
2018 73.0 91.2
2017   102.4
Prior 416.0 415.6
Mortgage loans, Total amortized cost 4,097.8 3,314.0
Residential mortgage loans | Non-performing    
Vintage year, Mortgage loans    
2021 3.6  
2020 3.1 1.8
2019 1.3 0.6
2018 1.6  
2017   0.8
Prior 6.0 2.7
Mortgage loans, Total amortized cost $ 15.6 $ 5.9
Vintage year, Direct financing leases    
Mortgage loans, Days delinquent to be considered non-performing 90 days