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Financial Instruments - Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Investments, All Other Investments [Abstract] |  |
Par value of available-for-sale debt securities | $ 21.8 | $ 24.9

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- Definition Amortized cost 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: 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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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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