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Incentive Plan (Tables) | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Deferred Compensation | Below is a summary of our compensation expense for the three months ended March 31, 2018 and 2017 and our unearned compensation as of March 31, 2018 and December 31, 2017 (in millions):
|  | Deferred Compensation |  | Unearned Compensation |  | Expected period to recognize unearned compensation (in years)
|  | Expensed |  | Capitalized |  | As of March 31, 2018 |  | As of December 31, 2017 |
|  | Three Months Ended March 31, |  |  |
Type of incentive award |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |  |
Long-term incentive units |  | $ | 0.9 |  |  | $ | 0.7 |  |  | $ | 0.2 |  |  | $ | 0.4 |  |  | $ | 15.0 |  |  | $ | 6.9 |  |  | 3.2
Market performance-based awards |  | 3.1 |  |  | 2.1 |  |  | 0.3 |  |  | 0.7 |  |  | 44.7 |  |  | 24.7 |  |  | 2.6
Restricted stock |  | 1.5 |  |  | 1.0 |  |  | 1.1 |  |  | 0.8 |  |  | 30.5 |  |  | 17.5 |  |  | 3.2
Summary of Long-Term Incentive Unit Activity | Below is a summary of our long-term incentive unit activity for the three months ended March 31, 2018.
Unvested Long-term Incentive Units | Units |  | Weighted-Average Grant Date Fair Value
Unvested, beginning of period | 99,295 |  |  | $ | 90.59 |
Granted | 92,361 |  |  | 99.01 |
Vested | (16,313 | ) |  | 100.18 |
Unvested, end of period | 175,343 |  |  | $ | 94.13 |
Market Performance Based Awards | In the event that the RMS Relative Market Performance during the Market Performance Period is achieved at the “threshold,” “target” or “high” level as set forth below, the awards will become vested as to the market condition with respect to the percentage of Class D units or RSUs, as applicable, set forth below:
Level | RMS Relative Market Performance | Market Performance Vesting Percentage
Below Threshold Level | ≤ -300 basis points | 0%
Threshold Level | -300 basis points | 25%
Target Level | 100 basis points | 50%
High Level | > 500 basis points | 100%
Schedule Of Valuation Assumptions | Assumptions used in the valuations are summarized as follows:
Award Date |  | Expected Stock Price Volatility |  | Risk-Free Interest rate
January 1, 2017 |  | 25% |  | 1.49%
February 28, 2017 |  | 23% |  | 1.43%
January 1, 2018 |  | 22% |  | 1.98%
March 1, 2018 |  | 22% |  | 2.34%
March 9, 2018 |  | 22% |  | 2.42%
Summary of Restricted Stock Activity | Below is a summary of our restricted stock activity for the three months ended March 31, 2018.
Unvested Restricted Stock | Shares |  | Weighted-Average Grant Date Fair Value
Unvested, beginning of period | 259,422 |  |  | $ | 90.54 |
Granted | 154,647 |  |  | 99.34 |
Vested | (80,614 | ) |  | 81.99 |
Unvested, end of period | 333,455 |  |  | $ | 96.64 |

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- Definition Schedule of Share-based Compensation, Performance Based Awards + References No definition available. + Details
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- Definition Schedule Of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block] + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20517-108367 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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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