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Investments - Allowance for Credit Loss (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Allowance for Credit Loss
Additions for credit losses on securities for which an allowance was not previously recorded	$ 7.6
Ending balance	7.6
Corporate debt securities
Allowance for Credit Loss
Additions for credit losses on securities for which an allowance was not previously recorded	7.0
Ending balance	7.0
Commercial mortgage-backed securities
Allowance for Credit Loss
Additions for credit losses on securities for which an allowance was not previously recorded	0.4
Ending balance	0.4
Collateralized debt obligations
Allowance for Credit Loss
Additions for credit losses on securities for which an allowance was not previously recorded	0.1
Ending balance	0.1
Other debt obligations
Allowance for Credit Loss
Additions for credit losses on securities for which an allowance was not previously recorded	0.1
Ending balance	$ 0.1

X

- Definition

Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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X

- Definition

Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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