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Employee Retirement Plans - Weighted Average Rate of Assumptions for Asset Allocation Plans (Details) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract] |  |
Benefits increasing with RPI limited, percentage | 5.00% |
Discount rate | 2.85% | 3.75%
Rate of compensation increases (Merchant Navy Officers Pension Fund only) |  | 4.55%
Rate of future RPI inflation | 3.20% | 3.05%
Rate of future CPI inflation | 2.10% | 1.95%
Pension increases in payment | 3.05% | 2.90%
Long-term rate of return on assets | 3.17% | 4.50%

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- Definition Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Pension Increase + References No definition available. + Details
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- Definition Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Future Consumer Price Index Inflation + References No definition available. + Details
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- Definition Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Future Retail Price Index Inflation + References No definition available. + Details
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- Definition Defined benefit plan assumptions used calculating net periodic benefit cost rate of pension increase. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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