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Incentive Plan (Market Performance Based Awards) (Details) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 09, 2018 | Mar. 01, 2018 | Feb. 27, 2018 | Jan. 01, 2018 | Feb. 28, 2017 | Jan. 01, 2017 | Jan. 31, 2018 shares | Mar. 31, 2018 USD ($) simulation shares | Dec. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  |  |  |  |  | 95,592 |
Market performance-based awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  |  |  | 3 years |
Number of trials | simulation |  |  |  |  |  |  |  | 100,000 |
Expected Stock Price Volatility | 22.00% | 22.00% |  | 22.00% | 23.00% | 25.00% |  |  |
Risk-Free Interest rate | 2.42% | 2.34% |  | 1.98% | 1.43% | 1.49% |  |  |
Fair value of awards | $ |  |  |  |  |  |  |  | $ 96.7 |
Award requisite service period |  |  |  |  |  |  |  | 4 years |
Unearned compensation | $ |  |  |  |  |  |  |  | $ 44.7 | $ 24.7
Market performance-based awards | Below Threshold Level |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance threshold percentage |  |  |  |  |  |  |  | (3.00%) |
Vesting percentage |  |  |  |  |  |  |  | 0.00% |
Market performance-based awards | Threshold Level |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance threshold percentage |  |  |  |  |  |  |  | (3.00%) |
Vesting percentage |  |  |  |  |  |  |  | 25.00% |
Market performance-based awards | Target Level |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance threshold percentage |  |  |  |  |  |  |  | 1.00% |
Vesting percentage |  |  |  |  |  |  |  | 50.00% |
Market performance-based awards | High Level |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance threshold percentage |  |  |  |  |  |  |  | 5.00% |
Vesting percentage |  |  |  |  |  |  |  | 100.00% |
Class D Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  |  |  |  |  | 2,165,692 |
Vested (shares) |  |  |  |  |  |  | 363,193 |  |
Distribution Equivalent Unit |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vested (shares) |  |  |  |  |  |  | 36,246 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  |  |  |  |  | 590,569 |
Vested (shares) |  |  |  |  |  |  | 49,707 |  |
2015 Performance Grant | Market performance-based awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 50.00% |  |  |  |  |  |
2015 Performance Grant | Market performance-based awards | Tranche Five |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 50.00% |
2016 Performance Grant | Market performance-based awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  |  |  | 3 years |
2017 Performance Grant | Market performance-based awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  |  |  | 3 years |
2017 Performance Grant | Market performance-based awards | Tranche Five |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 50.00% |
2017 Performance Grant | Market performance-based awards | Tranche Six |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 50.00% |
2018 Performance Grant | Market performance-based awards | Tranche Five |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 50.00% |
2018 Performance Grant | Market performance-based awards | Tranche Six |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 50.00% |

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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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