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Stock-Based Compensation - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant | 11,578,219 |  | 11,578,219 |  |  | 11,578,219
Shares granted |  |  | 2,411,345 |  |  |
Shares granted, weighted average grant date fair value |  |  | $ 11.62 |  |  |
Unrecognized compensation cost relating to unvested restricted stock | $ 69,500,000 |  | $ 69,500,000 |  |  | $ 69,500,000
Unrecognized compensation cost relating to unvested restricted stock, recognition period (in years) |  |  | 2 years 10 months 24 days |  |  |
Four Zero One K Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employer Discretionary Contribution Amount | 1,500,000 |  | $ 4,500,000 |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted |  |  | 2,411,345 | 2,022,198 |  |
Shares granted, weighted average grant date fair value |  |  | $ 11.62 | $ 10.44 |  |
Compensation and benefits expense | 7,500,000 | $ 7,700,000 | $ 22,800,000 | $ 23,200,000 |  |
Restricted Stock | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted, vesting period |  |  | 3 years | 3 years |  |
Restricted Stock | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted, vesting period |  |  | 5 years | 5 years |  |
Performance-Based Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted |  |  | 446,181 |  | 418,674 | 864,855
Compensation and benefits expense | $ 863,000,000 | $ 411,000,000 | $ 1,800 | $ 689,000,000 |  |
Vesting rights, description |  |  | Included in this total are 446,181 shares granted during the nine months ended September 30, 2020, which have a performance period of January 1, 2020 to December 31, 2022 and vest on April 1, 2023, subject to adjustment or forfeiture, based upon the achievement by the Company of certain performance standards The Company granted 418,674 PSUs during 2019, which have a performance period of January 1, 2019 to December 31, 2021 and vest on April 1, 2022, subject to adjustment or forfeiture, based upon the achievement by the Company of certain performance standards. |  |  |

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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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