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Stockholders' Deficit - Restricted Stock Units (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation | $ 113.0 | $ 56.0 | $ 32.0
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation | 75.0 | 26.0 | 19.0
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized | $ 60.0 |  |
Weighted-average period of amortization | 2 years |  |
Fair value at vesting date | $ 87.5 | $ 16.8 | $ 22.0
Number of Restricted Stock Units (in shares) [Roll Forward] |  |  |
Unvested units outstanding at the beginning of the period (in shares) | 3.3 |  |
Number of RSUs granted (in shares) | 1.2 |  |
Number of RSUs vested (in shares) | (1.6) |  |
Number of RSUs cancelled (in shares) | (0.2) |  |
Unvested units outstanding at the end of the period (in shares) | 2.7 | 3.3 |
Weighted Average Grant Date Fair Value (in dollars per share) [Roll Forward] |  |  |
Weighted average grant date fair value of unvested units outstanding at the beginning of the period (in usd per share) | $ 19.07 |  |
Fair value of RSUs granted (in usd per share) | 55.64 | $ 13.75 |
Fair value of RSUs vested (in usd per share) | 24.70 |  |
Fair value of RSUs cancelled (in usd per share) | 27.96 |  |
Weighted average grant date fair value of unvested units outstanding at the end of the period (in usd per share) | $ 32.03 | 19.07 |
Equity Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized | $ 2.0 |  |
Weighted-average period of amortization | 2 years |  |
Weighted Average Grant Date Fair Value (in dollars per share) [Roll Forward] |  |  |
Fair value of RSUs granted (in usd per share) | $ 74.16 | $ 35.41 | $ 22.25

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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