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Share-Based Compensation - RSUs and PBRSUs Summary (Details) - Unvested restricted stock units - Stock Option Plan Amended Restated 2007 Equity Incentive Plan $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares
Number of Shares
Non-vested units (in shares) | shares	3,712
Granted (in shares) | shares	3,262
Vested (in shares) | shares	(788)
Forfeited (in shares) | shares	(301)
Non-vested units (in shares) | shares	5,885
Weighted Average Grant Date Fair Value
Non-vested units (in dollars per share) | $ / shares	$ 10.59
Granted (in dollars per share) | $ / shares	11.02
Vested (in dollars per share) | $ / shares	9.28
Forfeited (in dollars per share) | $ / shares	10.32
Non-vested units (in dollars per share) | $ / shares	$ 11.09
Additional Disclosures
Non-vested units, weighted average remaining years	2 years 8 months 12 days
Non-vested units, aggregate intrinsic value | $	$ 73.5

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

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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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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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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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