Share-Based Compensation Weighting for Components of Performance Based RSU Awards (Details) - PLC Long Term Incentive Plan |
6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Jun. 30, 2015 | ||||||||
| 2013 - 2015 Grants [Member] | ||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Average Return on Net Assets (1) | [1] | 50.00% | ||||||
| Cumulative Earnings Per Share (2) | [2] | 30.00% | ||||||
| Relative Total Shareholder Return (3) | [3] | 20.00% | ||||||
| 2012 Grant | ||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Average Return on Net Assets (1) | [1] | 50.00% | ||||||
| Cumulative Net Income | 30.00% | |||||||
| Relative Total Shareholder Return (3) | [3] | 20.00% | ||||||
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