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Share-Based Compensation - Incentive Unit Awards (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Share-Based Compensation |  |  |  |  |
Personnel accruals | $ 41.1 |  | $ 41.1 |  | $ 45.7
Incentive Unit Award |  |  |  |  |
Share-Based Compensation |  |  |  |  |
Vesting period |  |  | 3 years |  |
Number of share right to receive cash payment on vesting equal to fair market value is received per award (in shares) |  |  | 1 |  |
Unrecognized compensation cost | 2.3 |  | $ 2.3 |  |
Weighted-average period for amortization of unrecognized compensation cost |  |  | 1 year |  |
Compensation expense (benefit) | 1.0 | $ 1.5 | $ 1.1 | $ 3.9 |
Incentive Unit Award | Personnel Accruals |  |  |  |  |
Share-Based Compensation |  |  |  |  |
Personnel accruals | $ 3.7 |  | $ 3.7 |  | $ 2.6
Tranche One | Incentive Unit Award |  |  |  |  |
Share-Based Compensation |  |  |  |  |
Vesting rights percentage |  |  | 33.33% |  |
Tranche Two | Incentive Unit Award |  |  |  |  |
Share-Based Compensation |  |  |  |  |
Vesting rights percentage |  |  | 33.33% |  |
Tranche Three | Incentive Unit Award |  |  |  |  |
Share-Based Compensation |  |  |  |  |
Vesting rights percentage |  |  | 33.33% |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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=6415400&loc=d3e5070-113901 + Details
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