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Balance Sheet Details - Net Gain (Loss) Recognized on Equity Securities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net gain recognized on equity securities |  |  |
Net gains and losses recognized during the period on equity securities | $ 0.0 | $ (4.2) | $ 80.1
Less: Net gains and losses recognized during the period on equity securities sold during the period | 0.0 | 4.2 | (44.1)
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date | $ 0.0 | $ 0.0 | $ 36.0

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- Definition Amount of unrealized and realized gain (loss) on investment in debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition Amount of realized gain (loss) on investment in debt and equity securities. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) on investment in debt and equity securities. + References No definition available. + Details
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- References No definition available. + Details
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