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Investments - Allowance for Credit Losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for Credit Losses at Beginning of the Year | $ 4,600,000 | $ 0
Impact of Adopting ASU 2016-13 |  | 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 2,300,000 | 5,400,000
Net Increases/(Decreases) in Allowance on Previously Impaired Securities | (1,500,000) |
Allowance for Credit Losses at End of Period | 5,400,000 | 5,400,000
Foreign Governments |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for Credit Losses at Beginning of the Year | 1,100,000 | 0
Impact of Adopting ASU 2016-13 |  | 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 100,000 | 600,000
Net Increases/(Decreases) in Allowance on Previously Impaired Securities | (600,000) |
Allowance for Credit Losses at End of Period | 600,000 | 600,000
Bonds and Notes |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for Credit Losses at Beginning of the Year | 3,500,000 | 0
Impact of Adopting ASU 2016-13 |  | 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 2,200,000 | 4,800,000
Net Increases/(Decreases) in Allowance on Previously Impaired Securities | (900,000) |
Allowance for Credit Losses at End of Period | $ 4,800,000 | $ 4,800,000

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- 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=121582814&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=121582814&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=121645371&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=121558606&loc=SL82898722-210454 + Details
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- 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=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for 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), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + 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 (f) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of increase (decrease) in allowance for credit loss of 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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