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Stock-based Compensation - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2019
Awards (in millions)
Beginning Balance	7.2
Granted (in shares)	0.8
Exercised (in shares)	(3.6)
Forfeited (in shares)	(0.8)
Ending Balance	3.6
Weighted Average Exercise Price (usd per share)
Beginning Balance	$ 19.32
Granted (usd per share)	26.91
Exercised (usd per share)	12.63
Forfeited (usd per share)	28.94
Ending Balance	$ 25.77
Vested and Expected to Vest
Vested and expected to vest, in shares	3.6
Vested and expected to vest, weighted average exercise price (usd)	$ 25.77
Vested and expected to vest, aggregate intrinsic value	$ 17.6
Vested and expected to vest, weighted average contractual life (in years)	6 years 1 month 13 days
Exercisable
Exercisable, in shares	2.5
Exercisable, usd per share	$ 24.84
Exercisable, aggregate intrinsic value	$ 15.3
Exercisable, weighted average contractual life (in years)	5 years 7 days

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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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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 exercisable options that may 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 price at which option holders acquired shares when converting their stock options into shares.

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