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PENSIONS - Asset Allocation (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Marine Scheme |  |  |
Pensions: |  |  |
Target allocation |  | 100.00% | 100.00%
Marine Scheme | Equity |  |  |
Pensions: |  |  |
Target allocation, minimum |  | 30.00% | 30.00%
Target allocation, maximum |  | 65.00% | 65.00%
Marine Scheme | Bonds |  |  |
Pensions: |  |  |
Target allocation, minimum |  | 10.00% | 10.00%
Target allocation, maximum |  | 50.00% | 50.00%
Marine Scheme | Other |  |  |
Pensions: |  |  |
Target allocation, minimum |  | 20.00% | 20.00%
Target allocation, maximum |  | 40.00% | 40.00%
UK Scheme |  |  |
Pensions: |  |  |
Target allocation |  | 100.00% | 100.00%
UK Scheme | Equity |  |  |
Pensions: |  |  |
Target allocation |  | 75.20% | 75.70%
UK Scheme | Bonds |  |  |
Pensions: |  |  |
Target allocation |  | 24.80% | 24.30%
Scenario, Forecast | Marine Scheme | Equity |  |  |
Pensions: |  |  |
Target allocation, minimum | 30.00% |  |
Target allocation, maximum | 65.00% |  |
Scenario, Forecast | Marine Scheme | Bonds |  |  |
Pensions: |  |  |
Target allocation, minimum | 10.00% |  |
Target allocation, maximum | 50.00% |  |
Scenario, Forecast | Marine Scheme | Other |  |  |
Pensions: |  |  |
Target allocation, minimum | 20.00% |  |
Target allocation, maximum | 40.00% |  |

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