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Share-Based Compensation Plans (Summary of Stock Options Grant) (Details) - $ / shares shares in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Summary of the changes in outstanding stock options
Outstanding, beginning of period (in shares)	2,076
Granted (in shares)	309
Exercised (in shares)	(97)
Forfeited (in shares)	(29)
Outstanding, end of period (in shares)	2,259	2,076
Options exercisable, ending of period (in shares)	1,515
Vested and expected, end of period (in shares)	2,150
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in usd per share)	$ 37.44
Granted (in usd per share)	75.18
Exercised (in usd per share)	35.81
Forfeited (in usd per share)	44.57
Outstanding, end of period (in usd per share)	42.58	$ 37.44
Options exercisable, end of period (in usd per share)	35.21
Vested and expected, end of period (in usd per share)	$ 40.92
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Roll Forward]
Outstanding, weighted average remaining contractual term	5 years 9 months 18 days	7 years
Options exercisable, end of period	6 years 2 months 12 days
Vested and expected to vest, end of period	5 years 10 months 25 days

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.

+ References

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-Publisher FASB
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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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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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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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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 exercise price, at which grantee can acquire shares reserved for issuance, for 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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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 that were terminated.

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

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