Share-Based Compensation (Grants of Stock Options and RSUs) (Details) - $ / shares	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Stock Options [Member]
Equity awards, granted, in shares	165,113	230,259
Weighted average fair value per award, in dollars per share	$ 18.22	$ 15.86
RSUs [Member]
Equity awards, granted, in shares	107,423	109,241
Weighted average fair value per award, in dollars per share	$ 72.46	$ 58.42

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration