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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units - Share-based Payment Arrangement, Nonemployee - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Shares |  |  |
Outstanding at beginning of period (in shares) | 704,284 | 574,219 | 490,415
Granted and fully vested (in shares) | 107,710 | 130,065 | 83,804
Issued (in shares) | (566,096) | 0 | 0
Forfeited (in shares) | 0 | 0 | 0
Outstanding at end of period (in shares) | 245,898 | 704,284 | 574,219
Weighted- Average Grant Date Fair Value per Share |  |  |
Outstanding at beginning of period (in dollars per share) | $ 17.99 | $ 18.47 | $ 17.41
Granted and fully vested (in dollars per share) | 18.51 | 15.88 | 24.70
Issued (in dollars per share) | 17.04 | 0 | 0
Forfeited (in dollars per share) | 0 | 0 | 0
Outstanding at end of period (in dollars per share) | $ 20.41 | $ 17.99 | $ 18.47
Additional disclosures |  |  |
Aggregate intrinsic value | $ 5 |  |

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- Definition The intrinsic value of vested and nonvested awards on equity-based plans excluding option plans (for example, stock appreciation rights plans) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that granted and fully vested during the reporting period. + References No definition available. + Details
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- Definition The number of shares 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 No definition available. + Details
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- Definition Represents the weighted average fair value at grant date for shares 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 No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Granted and Vested in Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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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 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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