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Investments (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Securities
Sep. 30, 2018
USD ($)
Dec. 31, 2018
Securities
Investments [Abstract]      
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations 98.00%   97.00%
Number of securities in unrealized loss position | Securities 886   2,715
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade 68.00%   87.00%
Proceeds from sales of available for sale securities $ 707.5 $ 1,800.0  
Principal repayments, calls and tenders of available for sale securities $ 1,500.0 $ 997.6