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Investments (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) Securities	Mar. 31, 2020 USD ($)	Dec. 31, 2020 Securities
Investments [Abstract]
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations	97.00%		97.00%
Number of securities in unrealized loss position | Securities	819		843
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade	77.00%		75.00%
Proceeds from sales of available for sale fixed maturity securities	$ 122.2	$ 910.3
Principal repayments, calls and tenders for available for sale fixed maturity securities	$ 1,000.0	$ 1,000.0

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- Definition

This item represents the percentage of unrealized losses on fixed maturity securities that is on securities classified as investment grade.

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Represents the percentage of fixed income securities at fair value rated investment grade (NAIC 1 or 2) compared to the entire fixed income security portfolio at fair value.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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- Definition

Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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