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Share-Based Compensation Plans (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2019 $ / shares shares
Restricted Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based compensation awards, number of shares granted | shares | 178,015
Share-based compensation awards, grant date | Feb. 27, 2019
Share-based compensation awards, per option fair value | $ / shares | $ 223.45
Performance Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based compensation awards, number of shares granted | shares | 16,855
Share-based compensation awards, per option fair value | $ / shares | $ 223.45

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- Definition Options grant date. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Details
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- Details
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