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Share-Based Compensation Plans Summary of the awards granted under the Plains (Details) - shares shares in Thousands | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total (in shares) | 700 | 721
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options (in shares) | 465 | 513
Market-based restricted stock rights |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock rights, granted during period (in shares) | 46 | 34
Performance-based restricted stock rights |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock rights, granted during period (in shares) | 79 | 45
Time-vested restricted stock rights |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock rights, granted during period (in shares) | 110 | 129

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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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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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 Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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