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Share-Based Compensation Weighting for Components of Performance Based RSU Awards (Details) - PLC Long Term Incentive Plan | 9 Months Ended
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Sep. 30, 2018
2016 - 2017 Grants |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Average return on net assets | 50.00% | [1]
Cumulative earnings per share | 30.00% |
Relative total shareholder return | 20.00% | [2]
2016 - 2018 Grants [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Average return on net assets | 50.00% | [1]
Cumulative net income | 25.00% |
Relative total shareholder return | 25.00% | [2]
[1] | Average return on net assets is measured by tax-affected operating income divided by average net working capital plus average net property, plant and equipment for each calendar year during the respective performance period.
[2] | Relative total shareholder return is measured by comparing the average closing price per share of the Company’s ordinary shares for the specified trading days in the fourth quarter of the end of the performance period to the average closing price per share of the Company’s ordinary shares for the specified trading days in the fourth quarter of the year preceding the grant, including dividends, and assessed against a comparable measure of competitor and peer group companies.

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- Definition Represents the percentage weighting of the impact of the return on net assets metric for performance based awards granted. + References No definition available. + Details
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- Definition Represents the weighting given to the performance based criteria of cumulative earnings per share in the 2013 Q1 LTIP grant + References No definition available. + Details
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- Definition Represents the percentage weighting of the impact of the cumulative net income metric for performance based awards granted. + References No definition available. + Details
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