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Private Placement Warrants and Unvested Founder Shares (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Private Placement Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Fair value of warrants or unvested founder shares | $ 32.2 | $ 32.2 | $ 44.5
Gain on fair value of warrants or unvested founder shares | (30.0) | (12.3) |
Unvested Founder Shares |  |  |
Class of Warrant or Right [Line Items] |  |  |
Fair value of warrants or unvested founder shares | 38.9 | 38.9 | $ 62.1
Gain on fair value of warrants or unvested founder shares | $ (46.6) | $ (23.2) |

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
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