Stock-Based Compensation - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Equity Awards
Outstanding at the beginning of the Period (in shares)	982,370
Granted (in shares)	387,204
Exchanged	860,557
Forfeited	(11,870)
Vested	(851,764)
Outstanding at the end of the Period (in shares)	1,366,497	982,370
Weighted Average Grant Date Fair Value
Unvested outstanding as of December 31, 2016	$ 6.45
Granted	15.95
Exchanged	18.94
Forfeited	15.74
Vested	18.37
Unvested outstanding as of September 30, 2017	$ 9.49	$ 6.45
Weighted- Average Remaining Contractual Life
Weighted- Average Remaining Contractual Life (in years)	1 year 22 days	1 year 4 months 28 days
Aggregate Intrinsic Value
Aggregate fair value	$ 13.0	$ 6.3

Aggregate intrinsic value.

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Share based compensation arrangement by share based payment award equity instruments other than options exchanged in period.

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Share based compensation arrangement by share based payment award equity instruments other than options exchanged in period weighted average grant date fair value.

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Sharebased compensation arrangement by sharebased payment award equity instruments other than options aggregate fair value unvested outstanding.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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.

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-Publisher FASB
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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).

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The weighted average fair value at grant date for nonvested equity-based awards 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).

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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.

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-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) 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.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Name Accounting Standards Codification
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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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