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Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2023
Incentive Plans |
Market Performance Based Awards | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Market
​ | ​ | ​ | Performance
​ | RMS Relative | ​ | Vesting
Level | Market Performance | ​ | Percentage
Below Threshold Level | ≤ -500 basis points | ​ | 0 | %
Threshold Level | -500 basis points | ​ | 25 | %
Target Level | 0 basis points | ​ | 50 | %
High Level | ≥ 500 basis points | ​ | 100 | %
​
Schedule of compensation expense and unearned compensation | Below is a summary of our compensation expense and our unearned compensation (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Expected
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | period to
​ | ​ | Deferred Compensation | ​ | Unearned Compensation |  | recognize
​ | ​ | Expensed | ​ | Capitalized | ​ | As of | ​ | As of |  | unearned
​ |  | Three Months Ended March 31, |  | March 31, | ​ | December 31, |  | compensation
Type of incentive award |  | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022 |  | (in years)
Long-term incentive units | ​ | $ | 2.8 | ​ | $ | 5.2 | ​ | $ | — | ​ | $ | — | ​ | $ | 25.0 | ​ | $ | 20.7 |  | 2.7
Performance-based awards | ​ |  | 4.1 | ​ |  | 5.0 | ​ |  | 0.1 | ​ |  | 0.2 | ​ |  | 27.2 | ​ |  | 30.3 |  | 2.5
Service-based restricted stock units | ​ |  | 7.7 | ​ |  | 5.3 | ​ |  | 1.1 | ​ |  | 1.0 | ​ |  | 92.7 | ​ |  | 55.4 |  | 3.1
Interxion awards | ​ | ​ | 0.7 | ​ | ​ | 0.9 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1.1 | ​ | ​ | 1.9 | ​ | 0.5
​
Summary of Long-Term Incentive Unit Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average
​ | ​ | ​ |  | Grant Date Fair
Unvested LTIP Units | ​ | Units |  | Value
Unvested, beginning of period |  | 279,258 | ​ | $ | 146.37
Granted |  | 142,987 | ​ |  | 104.08
Vested |  | (133,494) | ​ |  | 136.98
Cancelled or expired |  | (35,110) | ​ |  | 158.96
Unvested, end of period |  | 253,641 | ​ | $ | 125.73
​
Summary of Restricted Stock Activity | ​

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- Definition Tabular disclosure of an equity-based arrangement (such as stock or unit options and stock or unit awards) with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability. + 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 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5047-113901 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=6409961&loc=d3e20517-108367 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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