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Investments (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
Securities
Sep. 30, 2021
USD ($)
Dec. 31, 2021
Securities
Investments [Abstract]      
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations 98.00%   98.00%
Number of securities in unrealized loss position | Securities 4,404   1,427
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade 98.00%   85.00%
Proceeds from sales of available for sale fixed maturity securities $ 3,200.0 $ 446.4  
Principal repayments, calls and tenders for available for sale fixed maturity securities $ 2,000.0 $ 2,800.0