Share-Based Compensation Weighting for Components of Performance Based RSU Awards (Details) - PLC Long Term Incentive Plan |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2015 | ||||||||
| 2013 - 2015 Grants | ||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Average return on net assets (1) | 50.00% | [1] | ||||||
| Cumulative earnings per share (2) | 30.00% | [2] | ||||||
| Relative total shareholder return (3) | 20.00% | [3] | ||||||
| 2012 Grant | ||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Average return on net assets (1) | 50.00% | [1] | ||||||
| Cumulative Net Income | 30.00% | |||||||
| Relative total shareholder return (3) | 20.00% | [3] | ||||||
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