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Share-Based Payments - Performance Share Awards (PSAs) Narrative (Details) - Performance Shares [Member] | 12 Months Ended
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Dec. 31, 2018 measure period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of measures used to determine share payout | measure | 2
Share payout measures, operating income, number of periods | period | 3
Share payout measures, operating income, duration of period | 1 year
Award vesting period | 3 years
Minimum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares earned as a percentage of initial award | 0.00%
Maximum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares earned as a percentage of initial award | 200.00%

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number of Shares Earned, Percentage of Initial Award + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Measures Used to Determine Share Payout + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Share Payout Measures, Operating Income, Duration of Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Share Payout Measures, Operating Income, Number of Periods + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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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- Details
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- Details
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- Details
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