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Share-based Compensation - Stock Options Activity Rollforward (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Number of Shares
Outstanding at beginning of period (shares) | shares	790
Granted (shares) | shares	130
Exercised (shares) | shares	(260)
Forfeited / Cancelled (shares) | shares	(30)
Outstanding at end of period (shares) | shares	630
Vested and expected to vest (shares) | shares	620
Exercisable at end of year (shares) | shares	280
Weighted-average Exercise Price
Outstanding at beginning of period (usd per share) | $ / shares	$ 38.46
Granted (usd per share) | $ / shares	66.50
Exercised (usd per share) | $ / shares	32.09
Forfeited / Cancelled (usd per share) | $ / shares	54.90
Outstanding at end of period (usd per share) | $ / shares	46.01
Vested and expected to vest at end of year (usd per share) | $ / shares	45.71
Exercisable at end of year (usd per share) | $ / shares	$ 47.12
Outstanding at end of year, aggregate intrinsic value | $	$ 15.0
Vested and expected to vest at end of year, aggregate intrinsic value | $	6.9
Exercisable at end of year, aggregate intrinsic value | $	$ 14.9
Outstanding at end of year, weighted average contractual term	5 years 2 months 12 days
Vested and expected to vest at end of year, weighted average contractual term	5 years 1 month 6 days
Exercisable at end of year, weighted average contractual term	3 years 3 months 18 days

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- Definition

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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Number of options outstanding, including both vested and non-vested options.

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

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