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Investments - Impairment Losses (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items] |
Allowance for Credit Losses at Beginning of the Year | $ 0
Impact of Adopting ASU 2016-13 | 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 7,100,000
Reduction Due to Sales | (2,000,000.0)
Net Increase (Decrease) in Allowance on Previously Impaired Securities | (400,000)
Write-offs Charged Against Allowance | (1,400,000)
Allowance for Credit Losses at End of Period | 3,300,000
Foreign Governments |
Debt Securities, Available-for-sale [Line Items] |
Allowance for Credit Losses at Beginning of the Year | 0
Impact of Adopting ASU 2016-13 | 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 1,200,000
Reduction Due to Sales | (700,000)
Net Increase (Decrease) in Allowance on Previously Impaired Securities | (200,000)
Write-offs Charged Against Allowance | 0
Allowance for Credit Losses at End of Period | 300,000
Corporate Bonds and Notes |
Debt Securities, Available-for-sale [Line Items] |
Allowance for Credit Losses at Beginning of the Year | 0
Impact of Adopting ASU 2016-13 | 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 5,900,000
Reduction Due to Sales | (1,300,000)
Net Increase (Decrease) in Allowance on Previously Impaired Securities | (200,000)
Write-offs Charged Against Allowance | (1,400,000)
Allowance for Credit Losses at End of Period | $ 3,000,000.0

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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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