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Investments (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Securities
Sep. 30, 2019
USD ($)
Dec. 31, 2019
Securities
Investments [Abstract]      
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations 96.00%   98.00%
Number of securities in unrealized loss position | Securities 1,344   1,033
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade 67.00%   79.00%
Proceeds from sales of available for sale fixed maturity securities $ 1,100.0 $ 707.5  
Principal repayments, calls and tenders for available for sale fixed maturity securities $ 2,300.0 $ 1,500.0