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Share based Compensation - Stock Option Activity (Details) - Options to purchase common stock $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, December 31, 2017 (in shares) | shares	15,181
Options, Granted (in shares) | shares	2,077
Options, Exercised (in shares) | shares	(1,282)
Forfeited, Options (in shares) | shares	(200)
Options, Expired (in shares) | shares	(7)
Options outstanding, September 30, 2018 (in shares) | shares	15,769
Options, Vested and unvested expected to vest, September 30, 2018 (in shares) | shares	15,003
Options, Exercisable at September 30, 2018 (in shares) | shares	9,406
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Option outstanding, December 31, 2017 (in dollars per share) | $ / shares	$ 7.48
Options, Granted (in dollars per share) | $ / shares	15.36
Options, Exercised (in dollars per share) | $ / shares	6.62
Options, Forfeited (in dollars per share) | $ / shares	9.75
Options, Expired (in dollars per share) | $ / shares	10.45
Option outstanding, September 30, 2018 (in dollars per share) | $ / shares	8.56
Options, Vested and unvested expected to vest, September 30, 2018 (in dollars per share) | $ / shares	8.43
Options, Exercisable at September 30, 2018 (in dollars per share) | $ / shares	$ 7.26
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual life, options outstanding, September 30, 2018	7 years
Weighted average remaining contractual life, options vested and unvested expected to vest, September 30, 2018	6 years 11 months 6 days
Weighted average remaining contractual life, options exercisable at September 30, 2018	6 years
Aggregate intrinsic value, options outstanding, September 30, 2018 | $	$ 65.8
Aggregate intrinsic value, vested and unvested expected to vest, September 30, 2018 | $	63.9
Aggregate intrinsic value, exercisable at September 30, 2018 | $	$ 47.4

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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