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Stock-based Compensation - Schedule of Stock Options Roll Forward (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares) | shares	8.1
Granted (in shares) | shares	1.1
Exercised (in shares) | shares	(1.7)
Forfeited (in shares) | shares	(0.3)
Ending balance (in shares) | shares	7.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance (in dollars per share) | $ / shares	$ 16.54
Granted (in dollars per share) | $ / shares	29.74
Exercised (in dollars per share) | $ / shares	10.52
Forfeited (in dollars per share) | $ / shares	29.59
Ending balance (in dollars per share) | $ / shares	$ 19.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Vested and expected to vest (in shares) | shares	7.2
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	$ 19.32
Vested and expected to vest, aggregate intrinsic value | $	$ 48.0
Vested and expected to vest, weighted average remaining contractual term (in years)	5 years 9 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Exercisable (in shares) | shares	5.6
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 16.80
Exercisable, aggregate intrinsic value | $	$ 48.0
Exercisable, weighted average remaining contractual term (in years)	5 years 29 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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Gross number of share options (or share units) granted during the period.

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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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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 exercise price, at which grantee can acquire shares reserved for issuance, for 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 price at which option holders acquired shares when converting their stock options into shares.

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