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Share-Based Payments - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Summary of stock option activity and related information
Outstanding, December 31, 2017, Shares | shares	557
Outstanding, December 31, 2017, Weighted-Average Exercise Price Per Share | $ / shares	$ 30.53
Granted, Shares | shares	95
Granted, Weighted-Average Exercise Price Per Share | $ / shares	$ 53.79
Exercised (shares) | shares	(115)
Exercised, Weighted-Average Exercise Price Per Share | $ / shares	$ 27.79
Forfeitures, Shares | shares	0
Forfeiture, Weighted Average Exercise price Per Share | $ / shares	$ 0.00
Expirations, Shares | shares	0
Expirations, Weighted-Average Exercise Price Per Share | $ / shares	$ 0.00
Outstanding, December 31, 2018, Shares | shares	537
Outstanding, December 31, 2018, Weighted-Average Exercise Price Per Share | $ / shares	$ 35.22
Outstanding, December 31, 2018, Remaining Life	5 years 11 months
Outstanding, December 31, 2018, Aggregate Intrinsic Value | $	$ 14.2
Exercisable, December 31, 2018, Shares | shares	317
Exercisable, December 31, 2018, Weighted-Average Exercise Price Per Share | $ / shares	$ 27.65
Exercisable, December 31, 2018, Remaining Life	4 years 1 month
Exercisable, December 31, 2018, Aggregate Intrinsic Value | $	$ 10.8

X

- 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 or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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