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Share-Based Payments - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Shares
Outstanding, December 31, 2018 (in shares) | shares	537
Granted (in shares) | shares	106
Exercised (in shares) | shares	(78)
Outstanding, December 31, 2019 (in shares) | shares	565
Exercisable, December 31, 2019 (in shares) | shares	364
Weighted- Average Exercise Price per Share
Outstanding, December 31, 2018 (in USD per share) | $ / shares	$ 35.22
Granted (in USD per share) | $ / shares	63.77
Exercised (in USD per share) | $ / shares	17.73
Outstanding, December 31, 2019 (in USD per share) | $ / shares	43.02
Exercisable, December 31, 2019 (in USD per share) | $ / shares	$ 35.16
Weighted- Average Remaining Life (Years)
Outstanding, December 31, 2019	6 years 3 months 18 days
Exercisable, December 31, 2019	5 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding, December 31, 2019 | $	$ 14.8
Exercisable, December 31, 2019 | $	$ 12.4

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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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Gross number of share options (or share units) granted during the period.

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

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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